| 28 CFR Part 23 | 28 Code of Federal Regulations Part 23 | I&A | |
| 2SR | Second Stage Review | DHS | |
| 4Wd | Four Wheel Drive | FEMA | |
| A | Activity of Isotope | FEMA | |
| A | Ampere | FEMA | |
| A | Atomic Mass | FEMA | |
| A&E | Architectural and Engineering | FEMA | |
| A&FM | Aviation and Fire Management | FEMA | |
| A&M | Customs and Border Protection Air & Marine (CBP/A&M) | DHS | |
| A/D | Analog/Digital | FEMA | |
| A/N | Alert and Notification (see AN) | FEMA | |
| A2H | America's Second Harvest | FEMA | |
| AA | Affirmative Action | FEMA | |
| AA | Allocation Advice | FEMA | |
| AA | alternatives analysis | CWMD | OGC | |
| AA | Applicant Assistance | FEMA | |
| AA | Approval Authority | FEMA | |
| AA | Atomic Absorption | FEMA | |
| AA | Attribute Authority | FEMA | |
| AA | anti-aircraft improvised explosive device incident | S&T | |
| AAA | Access Approval Authority | DHS | |
| AAA | Agriculture Adjustment Administration | FEMA | |
| AAA | American Ambulance Association | FEMA | |
| AAA | Area Agency on Aging | FEMA | |
| AAACE | Airport Access Authorization to Commercial Establishments | S&T | |
| AAAE | American Association of Airport Executives | TSA | |
| AAC | Activity Address Code | FEMA | |
| AAC | Applicant Assistance Center | FEMA | |
| AACES | Automated, Adaptive Chemical Examination System | FEMA | |
| AACPP | Airport Access Control Pilot Program | FEMA | |
| AACS | Automated Access Control System | FEMA | |
| AAD | Assistant Associate Director | FEMA | |
| AADPIA | Assistant Associate Director for Public & Intergovernmental Affairs | FEMA | |
| AADR | Age-Adjusted Death Rate | FEMA | |
| AAEI | American Association of Exporters and Importers | CBP | |
| AAER | Average Annual Erosion Rate | FEMA | |
| AAFAS | Automated Airborne Flight Alert System | S&T | |
| AAFB | Andrews Air Force Base | DHS | |
| AAML | Agency Aviation Military Liaison | FEMA | |
| AAMS | Automated Acquisition Management System (ProTrac / ProDoc) | FEMA | |
| AAMVA | American Association of Motor Vehicle Administrators | TSA | |
| AAPA | American Association of Port Authorities | CBP | TSA | USCG | |
| AAPD | American Association of People with Disabilities | CRCL | |
| AAR | After action report | FEMA | |
| AAR | Association of American Railroads | FEMA | |
| AAR | After action review | DHS | |
| AASHTO | American Association of State Highway and Transportation Officials | FEMA | TSA | |
| AAU | Association of American Universities | USCIS | S&T | |
| AAVLD | American Association of Veterinary Laboratory Diagnosticians | S&T | |
| ABA | American Bar Association | FEMA | OGC | |
| ABA | American Bus Association | FEMA | |
| ABAG | Association of Bay Area Governments | FEMA | |
| ABC | [Outstanding] American By Choice Award | USCIS | |
| ABC | American Baptist Churches | FEMA | |
| ABC | Arizona Border Control Plan | CBP | |
| ABCI | Arizona Border Control Initiative | CBP | |
| ABCO | Automated Billing & Collection Off-sets | FEMA | |
| ABD | Air Bridge Denial | ICE | |
| ABEL | Agent Based Economic Laboratory | CISA | |
| ABF | Automatic Broadcast Feed | FEMA | |
| ABHS | Alcohol Based Hand Sanitizer | FEMA | |
| ABI | Automated Broker Interface | CBP | |
| ABIED | air-borne improvised explosive device | S&T | |
| ABIH | American Board of Industrial Hygiene | FEMA | |
| ABIS | see IDENT | I&A | |
| ABM | Anti-Ballistic Missile | FEMA | |
| ABMC | American Battle Monuments Commission | DHS | |
| ABNCP | Airborne Command Post | CISA | |
| ABO | Agents of Biological Origin | FEMA | |
| ABRO | Aircraft Base Radio Operator | FEMA | |
| ABS | Arson and Bomb Squad | CISA | I&A | |
| AC | Alternating Current | FEMA | |
| AC | Area Command | FEMA | |
| AC | Area Committee | FEMA | |
| AC | alternating current | S&T | |
| ACAA | Air Carrier Association for Americans | TSA | |
| ACAC | Area Command Aviation Coordinator | FEMA | |
| ACADA | Automatic Chemical Agent Detection and Alarm | CISA | S&T | |
| ACAMS | Automatic Continuous Air Monitoring System | FEMA | |
| ACAP | Agency-wide Corrective Action Program | FEMA | |
| ACAP | Alien Criminal Apprehension Program | ICE | |
| ACBIRC | Advanced Chemical/Biological Integrated Response Course | CISA | S&T | |
| ACC | American Chemistry Council | S&T | |
| ACC | Aviation Command Center | TSA | |
| ACC | Agency Command Center | FEMA | |
| ACC | Air Combat Command | FEMA | |
| ACCS | Accounting Classification Code Structure | FEMA | |
| ACCT | Account | FEMA | |
| ACCT | Accounting Technician | FEMA | |
| ACDA | United States Arms Control and Disarmament Agency | CWMD | |
| ACDO | Advanced Concept Demonstration Office | TSA | |
| ACDP | Aircraft Dispatcher | FEMA | |
| ACDR | Area Commander | FEMA | |
| ACE | Academy of Counter-Terrorist Education | FEMA | |
| ACE | Automated Commercial Environment (secure data portal) | CBP | |
| ACE | Automated Construction Estimate | FEMA | |
| ACE | Accumulated Cyclone Energy | OPS | |
| ACE | American Council on Education | USCIS | CISA | S&T | |
| ACE | Army Corps of Engineers | FEMA | TSA | CISA | |
| ACEP | American College of Emergency Physicians | FEMA | |
| ACF | Administration for Children and Families | FEMA | OPS | |
| ACF | Alternate Care Facility | FEMA | |
| ACF | Alternate Control Facility | FEMA | |
| ACFM | Advanced Certified Floodplain Manager | FEMA | |
| ACGIH | American Council of Government Industrial Hygienists | FEMA | |
| ACH | Automated Clearing House | FEMA | |
| AChE | Acetylcholinesterase | FEMA | |
| ACHP | Advisory Council on Historic Preservation | FEMA | CISA | |
| ACI | Advanced Contracting Initiative | FEMA | OPS | |
| ACI | Approved Course of Instruction | FEMA | |
| ACI | Airports Council International | TSA | PLCY | |
| ACI/NA | Airports Council International--North America | PLCY | |
| ACIP | Advisory Committee on Immunization Practices | FEMA | |
| ACIR | Advisory Commission on Inter-governmental Relations | FEMA | |
| ACIS | Aviation Credential Interoperability Solution | TSA | PLCY | PRIV | |
| ACL | Access Control List | FEMA | |
| ACM | alternative control measure | DHS | |
| ACM | asbestos-containing material | DHS | |
| ACMR | Assistant Cache Manager | FEMA | |
| ACMS | Academy Class Management System | FEMA | |
| ACO | Administrative Contracting Officer | FEMA | |
| ACO | Agency Claims Officer | FEMA | |
| ACO | Agency Collection Officer | FEMA | |
| ACO | Animal Control Officer | FEMA | |
| ACP | Accelerated Conversion Process | FEMA | |
| ACP | Access Control Points | FEMA | CISA | |
| ACP | Allied Communications Publication | FEMA | |
| ACP | Alternate Command Post | FEMA | |
| ACP | Area Command Post | FEMA | |
| ACP | Area Contingency Plan | FEMA | CISA | |
| ACPSEM | Advisory Council on Professional Standards for Emergency Managers | FEMA | |
| ACR | Acreage Conservation Reserve | FEMA | |
| ACR | Advance Confirmation Report | FEMA | |
| ACR | Agency Confirmation Report | FEMA | |
| ACS | Adventist Community Services | FEMA | |
| ACS | Alternate Command Staff | FEMA | |
| ACS | Automated Commercial System | CBP | |
| ACSD | Advanced Container Security Device (see CSD) | DHS | |
| ACSDR | Adventist Community Services Disaster Response | FEMA | |
| ACSI | American Customer Satisfaction Index | FEMA | |
| ACSM | American Congress of Surveying and Mapping | FEMA | CISA | |
| ACT | American Council for Technology | S&T | |
| ACT | Area Command Team | FEMA | |
| ACT FAST | Agent Characteristics Toxicity - First Aid and Special Treatment | FEMA | |
| ACTD | Advanced Concepts Technology Demonstration | FEMA | |
| ACTE | Association of Corporate Travel Executives | DHS | |
| ACTY | Activity | FEMA | |
| ACV | Actual Cash Value | FEMA | |
| ACV | Alarm Check Valve | FEMA | |
| ACVP | Airline Certificate Vetting Program | TSA | PLCY | PRIV | |
| ACWG | Air Cargo Working Group | TSA | |
| AD | Administratively Determined (also AD#) | FEMA | |
| AD | Assistant Director | FEMA | |
| AD | Associate Director | FEMA | |
| AD | Automatic Determination | FEMA | |
| ADA | Americans with Disabilities Act (1992) | CRCL | |
| ADAMS | Automated Disaster Assistance Management System | FEMA | |
| ADASHI | Automated Decision Aid System for Hazardous Incidents | FEMA | |
| ADASP | Aviation Direct Access Screening Program | TSA | S&T | |
| ADD | Automated Deployment Database | OPS | |
| ADDIE | Analysis, Design, Development, Implementation, and Evaluation | FEMA | |
| ADDS | Automated Disaster Deployment System | FEMA | |
| ADEM | Arizona Division of Emergency Management | FEMA | |
| ADEM | Arkansas Department of Emergency Management | FEMA | |
| ADES | Alaska Division of Emergency Services | FEMA | |
| ADFR | Arson Detection for the First Responder | FEMA | |
| ADGGS | Alaska Division of Geological and Geophysical Surveys | FEMA | |
| ADIS | Arrival and Departure Information System | CBP | ICE | USCIS | CISA | I&A | PLCY | PRIV | |
| ADIZ | Air Defense Identification Zone | TSA | |
| ADJ | Adjustable | FEMA | |
| ADL | Automated Distance Learning | FEMA | |
| ADM | Acquisition Decision Memorandum | FEMA | |
| ADM | Admiral | FEMA | |
| ADMIN | Administration | FEMA | |
| ADMIN | Administrative | FEMA | |
| ADMSYS | Admissions System | FEMA | |
| ADO | Airport District Office | FEMA | |
| ADO Team | Assistant Disbursing Officer Team | FEMA | |
| ADOS | Automated Document Ordering System | FEMA | |
| ADP | Automated Data Processing | FEMA | |
| ADPE | Automated Data Processing Equipment | FEMA | |
| ADR | Address | FEMA | |
| ADR | Alternative Dispute Resolution | FEMA | |
| ADR | American Disaster Reserve | FEMA | |
| ADRA | Adventist Development and Relief Agency | FEMA | |
| ADRA | Alternative Dispute Resolution Act | FEMA | |
| ADRA | Air Domain Risk Assessment | TSA | CISA | |
| ADRS | Automated Disaster Reporting System | FEMA | |
| ADTS | Automated Data Telecommunications Service | FEMA | |
| ADVISE | Analysis, Dissemination, Visualization, Insight and Semantic Enhancement | PRIV | |
| ADVON | Advanced Echelon | FEMA | |
| AE | Aero-medical Evacuation | FEMA | |
| AE | Architects and Engineering | FEMA | |
| AEA | American Economic Association | FEMA | |
| AEA | American Electronics Association | PRIV | |
| AEAS | Automated Exercise and Assessment System | FEMA | |
| AEC | Advanced Electronic Classroom | FEMA | |
| AEC | Agency Emergency Coordinator | FEMA | |
| AEC | Army Environmental Center (Aberdeen Proving Ground, Maryland) | FEMA | |
| AEC | Atomic Energy Commission | FEMA | |
| AECB | Atomic Energy and Control Board | FEMA | |
| AECC | Aero-medical Evacuation Control Center | FEMA | |
| AECC | Aero-Medical Evacuation Coordination Center | FEMA | |
| AECC | American Evangelical Christian Church | FEMA | |
| AECE | Aero-medical Evacuation Control Element | FEMA | |
| AECM | Aero-medical Evacuation Crew Members | FEMA | |
| AECR | Achieving Extraordinary Customer Relations | FEMA | |
| AED | Automated External Defibrillator | FEMA | |
| AEGL | Acute Exposure Guidelines Level | FEMA | |
| AEI | American Enterprise Institute | OPA | |
| AEIC | Alaska Earthquake Information Center | FEMA | |
| AEL | Adverse Effect Level | FEMA | |
| AEL | Airborne Exposure Limit | FEMA | |
| AEL | Authorized Equipment List | FEMA | |
| AELT | Aero-medical Evacuation Liaison Team | FEMA | |
| AEMA | Alabama Emergency Management Agency | FEMA | |
| AEOD | Analysis and Evaluation of Operation Data | FEMA | |
| AEP | Airport Emergency Plan | TSA | |
| AERT | Alaska Emergency Response Team | FEMA | |
| AES | Advanced Encryption Standard | FEMA | |
| AES | Aeromedical Evacuation System | FEMA | |
| AES | Automated Export System | CBP | |
| AEW | Airborne Early Warning | CBP | ICE | |
| AF | Acre Feet | FEMA | |
| AF | Air Force | FEMA | |
| AFA | Association of Flight Attendants | TSA | |
| AFB | Air Force Base | FEMA | USCG | CISA | |
| AFCEA | Armed Forces Communications and Electronics Association | USCG | MGMT | |
| AFD | Airport Facility Directory | FEMA | |
| AFEM | Alliance for Fire and Emergency Management | FEMA | |
| AFEWES | Air Force Electronic Warfare Evaluation Simulator | S&T | |
| AFFIRM | Association for Federal Information Resources Management | MGMT | |
| AFG | Assistance to Firefighters Grant Program | FEMA | FLETC | |
| AFGE | American Federation of Government Employees | FEMA | MGMT | |
| AFGWC | Air Force Global Weather Central | FEMA | |
| AFIP | Armed Forces Institute of Pathology | CWMD | |
| AFL-CIO | American Federation of Labor and Congress of Industrialized Organizations | CISA | |
| AFM | Adjudicator's Field Manual | USCIS | |
| AFMIC | Armed Forces Medial Intelligence Center | FEMA | |
| AFMLS | Asset Forfeiture & Money Laundering Section | FLETC | |
| AFMO | Assistant Fire Management Officer | FEMA | |
| AFMS | Automated Forms System | FEMA | |
| AFNSEP | Air Force National Security Emergency Preparedness | FEMA | |
| AFO | Area Field Office | FEMA | |
| AFOC | Air Force Operations Center | FEMA | |
| AFOSC | Air Force Operations Support Center | FEMA | |
| AFRAS | Association for Rescue at Sea | USCG | |
| AFRAT | Air Force Radiation Assessment Team | FEMA | |
| AFRB | Air Force Reserve Base | FEMA | |
| AFRCC | Air Force Rescue Coordination Center | FEMA | |
| AFRES | Air Force Reserve | FEMA | |
| AFRL | Air Force Research Laboratory | FEMA | |
| AFRRI | Armed Force Radiobiology Research Institute | FEMA | |
| AFSA | American financial Services Association | S&T | |
| AFSC | Armed Forces Staff College | FEMA | |
| AFSOF | Air Force Special Operations Forces | FEMA | |
| AFSP | Alien Flight Student Program | TSA | PLCY | PRIV | |
| AFSS | Automated Flight Service Station | FEMA | |
| AFTAC | Air Force Technical Applications Center | FEMA | |
| AFV | alternative fuel vehicle | DHS | |
| AG | Adjutant General | FEMA | OGC | |
| AG | Agriculture | FEMA | |
| AG | Attorney General | FEMA | OGC | |
| AGAR | Alternate Governor’s Authorized Representative | FEMA | |
| AGAUS | Adjutants General Association of the United States | CWMD | |
| AGC | Associate General Counsel | OGC | |
| AGC | Advanced Gas Centrifuge | FEMA | |
| AGC | Association of General Contractors | FEMA | |
| AGCA | Associated General Contractors of America | FEMA | |
| AGCR | Advanced Gas-Cooled Reactor | FEMA | |
| AGE | Aerospace Ground Equipment | FEMA | |
| AGILE | Advanced Geospatial Imagery Library Enterprise | FEMA | |
| AGL | Above Ground Level | FEMA | |
| AGR | Active Guard/Reserve | FEMA | |
| AGS | Aviation Group Supervisor | ICE | |
| AGV | Aggregate Value | FEMA | |
| AGY | Agency | FEMA | |
| AGZ | Actual Ground Zero | FEMA | |
| AH | Alternate Headquarters | FEMA | |
| AHAM | Association of Home Appliance Manufacturers | FEMA | |
| AHCC | Alternate Host Communications Center | FEMA | |
| AHG | Ad Hoc Group | FEMA | |
| AHIMT | All Hazards Incident Management Team | FEMA | |
| AHJ | Agency Having Jurisdiction | FEMA | |
| AHMA | American Hotel and Motel Association | FEMA | |
| AHRQ | Agency for Healthcare Research and Quality | FEMA | |
| AHT | Animal Health Technician | FEMA | |
| AHU | Air Handling Unit | FEMA | |
| AHUA | America Highway User Alliance | FEMA | |
| AI&H | Assistance to Individuals and Households | FEMA | |
| AI2 | Acquisition Improvement Initiative | FEMA | |
| AIA | American Institute of Architects | FEMA | |
| AIA | American Insurance Association | FEMA | |
| AIAA | American Institute of Aeronautics and Astronautics | S&T | |
| AIATP | Antiterrorism Intelligence Awareness Training Program | FLETC | |
| AIBS | American Institute of Biological Sciences | S&T | |
| AIC | Animal Identification Coordinator | FEMA | |
| AIC | Automated Inventory Control (formerly AIS) | FEMA | |
| AID | Agency for International Development | FEMA | |
| AIF | Assistance Information Form | FEMA | |
| AIG | Address Indicating Group | FEMA | |
| AIHEC | American Indian Higher Education Consortium | FEMA | |
| AILA | American Immigration Lawyers Association | USCIS | |
| AIMS | Arson Information Management System | FEMA | |
| AIMS | Automated Inventory Management System | FEMA | |
| AIP | Agreement in Principle | FEMA | |
| AIP | Airport Improvement Program | FEMA | |
| AIP | Assisted Imaging Processing | FEMA | |
| AIPC | All Indian Pueblo Council | FEMA | |
| AIR | active infrared sensor | S&T | |
| AIREP | Aircraft Report | FEMA | |
| AIS | Automated Information System | FEMA | CISA | I&A | |
| AIS | Automated Information Systems (see AIC) | FEMA | |
| AIS | automatic identification system | PLCY | |
| AIT | Aeromedical Isolation Team | FEMA | |
| AIT | automatic identification technology | MGMT | |
| AJ | Administrative Judge | FEMA | |
| AKA | Also Known As | DHS | |
| AKDT | Alaska Daylight Time (GMT - 8) | FEMA | |
| AKST | Alaska Standard Time (GMT - 9) | FEMA | |
| AL | Applicant Liaison | FEMA | |
| ALARA | As Low as Reasonably Achievable | FEMA | |
| ALB | Administration and Logistics Branch (US-VISIT) | CISA | |
| ALC | Agency Location Code | FEMA | |
| ALC | Agency Logistics Center | FEMA | |
| ALC | Annual Letter of Certification | FEMA | |
| ALCC | Airlift Control Center | FEMA | |
| ALCC | Airlift Coordination Cell | FEMA | |
| ALCE | Airlift Control Element | FEMA | |
| ALCOM | Alaskan Command | FEMA | |
| ALE | Additional Living Expenses | FEMA | |
| ALE | Automatic Link Establishment | FEMA | |
| ALERT | Automated Local Evaluation in Real Time | FEMA | |
| ALOHA | Aerial Locations Of Hazardous Atmospheres | FEMA | |
| ALPA | Airline Pilots Association | TSA | |
| ALS | Advanced Life Support | FEMA | OPS | |
| ALSM | Airborne Laser Swath Mapping (aka: "LIDAR") | FEMA | |
| ALT | Alternate | FEMA | |
| ALTRETCO | Alternate Regional Emergency Transportation Coordinator | FEMA | |
| ALUM | Aluminum | FEMA | |
| AM | Amplitude Modulation | FEMA | |
| AM | Ante Meridiem | FEMA | |
| AMA | American Medical Association | FEMA | |
| AMB | Air & Marine Branch (ICE/AMB) | DHS | |
| AMBUS | Ambulance Bus | FEMA | |
| AMC | Air Mobility Command | FEMA | |
| AMC | Army Materiel Command | FEMA | |
| AMCCOM | Armament Munitions and Chemical Command | FEMA | |
| AMD | Acquisition Management Division | FEMA | |
| AMEAGS | Automated Major Emergency Action Guidelist System | FEMA | |
| AMF | Alternative Morgue Facility | FEMA | |
| AMGS | Air & Marine Group Supervisor | ICE | |
| AMHS | Automated Message Handling System | CISA | I&A | |
| AMID | Air and Marine Interdiction Division | USCG | |
| AMINESKAL | American Indian Eskimo Aleutian | FEMA | |
| AMIO | Alien Migrant Interdiction Operations | CBP | USCG | |
| AML | ARC Macro Language | FEMA | |
| AMO | Air and Marine Operations (ICE) | ICE | |
| AMOC | Air and Marine Operations Center | ICE | I&A | OPS | |
| AMP | Amperage | FEMA | |
| AMP | asbestos management plan | DHS | |
| AMPS | Automated Message Processing System | FEMA | |
| AMR | Agricultural Mitigation and Restoration | FEMA | |
| AMS | Aerial Measuring System | FEMA | |
| AMS | American Meteorological Society | FEMA | |
| AMS | Automated Manifest System | CBP | |
| AMS | Atmospheric Monitoring System | CISA | |
| AMSC | Area Maritime Security Committee | I&A | |
| AMSLAN | American Sign Language | FEMA | |
| AMSP | Area Maritime Security Plan | USCG | I&A | |
| AMT | Amount | FEMA | |
| AMTI | Applied Marine Technology, Inc. | USCG | |
| AMTOR | Amateur Telegraphy Over Radio | FEMA | |
| AMWA | Association of Metropolitan Water Agencies | FEMA | |
| AN | Above Normal | FEMA | |
| AN | Alert and Notification (see A/N) | FEMA | |
| ANACI | Access National Agency Check and Inquiry | MGMT | |
| ANAD | Anniston Army Depot | FEMA | |
| ANCA | Anniston Chemical Activity | FEMA | |
| ANCDF | Anniston Chemical Disposal Facility | FEMA | |
| ANFAZD | Academic Network for Foreign Animal and Zoonotic Disease | S&T | |
| ANFO | Ammonium Nitrate and Fuel Oil | FEMA | |
| ANG | Air National Guard | FEMA | USCG | |
| ANG | Army National Guard | FEMA | |
| ANGB | Air National Guard Base | FEMA | |
| ANI | American Nuclear Insurers | FEMA | |
| ANI | Area Not Included | FEMA | |
| ANL | Argonne National Laboratories | S&T | |
| ANOC | Association of National Olympic Committees | FEMA | |
| ANPR | Advance Notice of Proposed Rulemaking | FEMA | |
| ANPRM | Advance Notice of Proposed Rulemaking [see NPRM and SNPRM] | OGC | |
| ANPSC | Alternate National Processing Service Center | FEMA | |
| ANRC | American National Red Cross | FEMA | |
| ANS | Alert and Notification System | FEMA | |
| ANS | Answer | FEMA | |
| ANS | Aquatic Nuisance Species | USCG | S&T | |
| ANSER | Analytic Services Inc. | S&T | |
| ANSI | American National Standards Institute | MGMT | PLCY | |
| ANSI-HSSP | American National Standards Institute-Homeland Securities Standards Panel | FEMA | |
| ANZUS | Australia, New Zealand and United States | PLCY | |
| AO | Action Officer | FEMA | |
| AO | Administrative Officer | FEMA | |
| AO | Area of Operations | FEMA | |
| AO | Assistance Officer | FEMA | |
| AO | Accrediting Official | MGMT | |
| AO | Security Accrediting Official | MGMT | |
| AO | authorizing official [special access program] | MGMT | |
| AO | Designated Approving Authority | MGMT | |
| AOA | Administration on Aging | FEMA | |
| AOA | analysis of alternatives | S&T | |
| AOA | Aviation Operations Area | TSA | USCG | OPS | |
| AOAC | Association for Official Analytical Communities | S&T | |
| AOBD | Air Operations Branch Director | FEMA | |
| AOBS | Aerial Observer | FEMA | |
| AOC | Aircraft Operating Center (NOAA) | FEMA | |
| AOC | Area of Concern | FEMA | |
| AOC | Army Operations Center | FEMA | |
| AOIC | Acting Official in Charge | FEMA | |
| AOPA | Aircraft Owners and Pilots Association | S&T | CWMD | |
| AOR | Area of Responsibility | FEMA | |
| AOSSP | Aircraft Operator Standard Security Program | TSA | |
| AOV | Agency Owned Vehicle | FEMA | |
| AP | Aerial Port | FEMA | |
| AP | Alternative Power | FEMA | |
| AP | Arrival Point | FEMA | |
| AP | Assembly Point | FEMA | |
| AP | Associated Press | FEMA | OPA | |
| AP | anti-personnel improvised explosive device incident | S&T | |
| AP&CP | Arson Prevention and Control Plan | FEMA | |
| APA | Administrative Procedure Act | OGC | |
| APA | American Planning Association | FEMA | |
| APB | Acquisition Program Baseline | FEMA | |
| APC | Agency Program Coordinator | FEMA | |
| APCO | Association of Public Safety Communications [Worldwide] | TSA | |
| APE | Area of Potential Effect | FEMA | |
| APEC | Asia Pacific Economic Cooperation | USCG | |
| APERMANS | Automated Personnel Management System | FEMA | |
| APG | Aberdeen Proving Ground | FEMA | |
| APHA | American Public Health Association | FEMA | |
| APHIS | Animal and Plant Health Inspection Service | CBP | CISA | I&A | OPS | |
| APHL | Association of Public Health Laboratories | FEMA | |
| API | Application Programming Interface | FEMA | |
| APIS | Advance Passenger Information System | CBP | FEMA | TSA | S&T | OPS | PLCY | PRIV | |
| APL | Annex Planning Leaders | FEMA | |
| APLCN | Application | FEMA | |
| APLCT | Applicant | FEMA | |
| APLNC | Appliance | FEMA | |
| APMB | Acquisition and Program Management Branch (US-VISIT) | CISA | |
| APO | Accountable Property Officer | FEMA | |
| APOD | Aerial Port of Debarkation | FEMA | |
| APOE | Aerial Port of Embarkation | FEMA | |
| APP | Apparatus | FEMA | |
| APP | Applicant | FEMA | |
| APP | Application | FEMA | |
| APP | Application Portability Profile | FEMA | |
| APP | affirmative procurement program | DHS | |
| APPN | Appropriation | FEMA | |
| APPT | Appointment | FEMA | |
| APR | Agency Procurement Review | FEMA | |
| APR | Air-Purifying Respirator | FEMA | |
| APRSAC | Academe and Policy Research Advisory Committee | PLCY | |
| APSO | Asylum Pre-Screening Officer | USCIS | |
| APSP | Automated Passenger Screening Profile | TSA | |
| APSRS | Aerial Photography Summary Record System | FEMA | |
| APSS | Automated Personnel Security System | FEMA | |
| APT | Administrative Payment Team | FEMA | |
| APTA | American Public Transportation Associations | TSA | |
| APTS | Association of Public Television Stations | FEMA | OPA | |
| APTS | Airport, Port, and Terminal Security | PLCY | |
| APWA | American Public Works Association | FEMA | |
| AQI | Agricultural Quarantine Inspections | FEMA | |
| AR | Acknowledge Receipt | FEMA | |
| AR | Aerial Reconnaissance | FEMA | |
| AR | Army Regulation | FEMA | |
| ARA | Aircraft Rental Agreement | FEMA | |
| ARA | Analog Radio Adapter | FEMA | |
| ARAA | Advanced Radiological Accident Assessment | FEMA | |
| ARAC | Atmospheric Release Advisory Capability | CISA | S&T | |
| ARAR | applicable or relevant and appropriate requirement | DHS | |
| ARB | Air Reserve Base | FEMA | |
| ARB | Acquisition Review Board | MGMT | |
| ARC | American Red Cross (also RC) | DHS | |
| ARC | Analytic Resources Catalog | FEMA | |
| ARCA | Area Requiring Corrective Action | FEMA | |
| ARCHIE | Automated Resource for Chemical Hazard Incident Evaluation | FEMA | |
| ARD | Advanced Radiation Detection | CWMD | |
| AREAL | Atmospheric Research and Exposure Assessment Laboratory | FEMA | |
| AREP | Agency Representative | FEMA | |
| ARES | Amateur Radio Emergency Services | FEMA | |
| ARF | Action Request Form | FEMA | |
| ARF | Aviation Route Forecast | FEMA | |
| ARFCAM | Autonomous Rapid Facility Chemical Agent Monitor | S&T | |
| ARFF | Aircraft Rescue Firefighting | FEMA | |
| ARFI | Areas Recommended For Improvement | FEMA | |
| ARG | Accident Response Group | FEMA | |
| ARI | Acute Respiratory Infection | FEMA | |
| ARIES | Airborne Rapid Imagery for Emergency Support | FEMA | |
| ARIO | Advanced Radiation Incident Operations | FEMA | |
| ARIP | Accidental Release Information Program | FEMA | |
| ARJIS | Automated Regional Justice Information System | FEMA | |
| ARL | Activities Result List | FEMA | |
| ARL | Airborne Reconnaissance Low | FEMA | |
| ARL-M | Airborne Reconnaissance Low - Multifunction | FEMA | |
| ARM | Aerial Radiological Monitor | FEMA | |
| ARMS | Automated Resource Management System (FEMA) | FEMA | |
| ARNG | Army National Guard | FEMA | USCG | |
| ARNGOPS | Army National Guard Operations | FEMA | |
| ARO | asset retirement obligation | DHS | |
| A-ROC | Alternate Regional Operations Center | FEMA | |
| ARP | Alarm Resolution Protocols | TSA | |
| ARP | Administration and Resource Planning | FEMA | |
| ARPA | Advanced Research Projects Agency | FEMA | |
| ARPANET | Advanced Research Projects Agency Network | FEMA | |
| ARRA | American Recovery & Reinvestment Act | FEMA | |
| ARRAS | Automatic Residential Remote Alarm System | FEMA | |
| ARRL | American Radio Relay League | FEMA | |
| ARS | Automatic Route Selection | FEMA | |
| ARS | Agricultural Research Service | DHS | |
| ARSOF | Army Special Operations Forces | FEMA | |
| ARSR | Air Route Surveillance Radar | TSA | |
| ART | Awards Review Team | FEMA | |
| ARTCC | Air Route Traffic Control Center | FEMA | |
| ARTS | Audit Report Tracking System | FEMA | |
| ARWO | Aerial Reconnaissance Weather Office | FEMA | |
| AS | Applicant Services | FEMA | |
| AS | Automatic Sprinkler | FEMA | |
| AS 06 | Ardent Sentry 06 (exercise) | FEMA | |
| ASA | Average Speed of Answer | USCIS | |
| ASA/IL&E | Assistant Secretary of the Army (Installation, Logistics and Environment) | FEMA | |
| ASAC | Aviation Security Advisory Committee | TSA | |
| ASAP | Aerospace Safety Advisory Panel | FEMA | |
| ASAP | All-Hazards Situation Assessment Prototype | FEMA | |
| ASAP | As soon as possible | DHS | |
| ASAP | Automated Standard Application for Payments | FEMA | |
| ASC | Advanced Systems Center | FEMA | |
| ASC | Allowable Stack Concentration | FEMA | |
| ASC | Area of Special Consideration | FEMA | |
| ASC | Application Support Center | USCIS | PLCY | PRIV | |
| ASCADS | Automated Sorting, Conversion and Distribution System | FEMA | |
| ASCE | American Society of Civil Engineers | FEMA | |
| ASCII | American Standard Code for Information Interchange | FEMA | |
| ASCS | Agricultural Stabilization and Conservation Services | FEMA | |
| ASD | Acoustic Surveillance Device | FEMA | |
| ASD | Allowable Stress Design | FEMA | |
| ASD | Assistant Secretary of Defense | FEMA | |
| ASD | Administrative Security Division | MGMT | |
| ASD (HD) | Assistant Secretary of Defense, Homeland Defense | FEMA | |
| ASD (SO/LIC) | Assistant Secretary of Defense (Special Operations/Low-Intensity Conflict) | FEMA | |
| ASDAR | Aircraft to Satellite Data Relay | FEMA | |
| ASDRC | Automated Systems Disaster Recovery Capabilities | FEMA | |
| ASDSO | Association of State Dam Safety Officials | FEMA | |
| ASDWA | Association of State Drinking Water Administrators | FEMA | |
| ASEAN | Association of Southeast Asian Nations | PLCY | |
| ASFPM | Association of State Floodplain Managers | FEMA | |
| ASGS | Air Support Group Supervisor | FEMA | |
| ASH | Assistant Secretary for Health | FEMA | |
| ASHA | Assistant Secretary for Health Affairs | FEMA | |
| ASHG | Accident Site Health Group | FEMA | |
| ASHRAE | American Society of Heating, Refrigeration and Air-Conditioning Engineers | FEMA | |
| ASI | America's Shield Initiative | FEMA | |
| ASIA | Anti-smuggling Investigators Association | FEMA | |
| ASIA | Assistant Secretary for Information Analysis | FEMA | |
| ASIANPACI | Asian Pacific Islander | FEMA | |
| ASIP | Assistant Secretary for Infrastructure Protection | FEMA | |
| ASIS | American Society for Industrial Security | PLCY | |
| ASIWPCA | Association of State and Interstate Water Pollution Control Administrators | FEMA | |
| ASL | Above Sea Level | FEMA | |
| ASL | American Sign Language | FEMA | |
| ASLB | Atomic Safety and Licensing Board | FEMA | |
| ASM | Air Support Manager | FEMA | |
| ASME | American Society for Microbiology | S&T | |
| ASME | American Society of Mechanical Engineers | S&T | |
| ASMRO | Armed Services Medical Regulating Office | FEMA | |
| ASMT | Assessment | FEMA | |
| ASN | Abstract Syntax Notation | FEMA | |
| ASOS | Automated Surface Observing System | FEMA | |
| ASP | Aviation Security Program | TSA | |
| ASP | Active Server Page | FEMA | |
| ASP | Advanced Spectroscopic Portal | CBP | CWMD | |
| ASP | Associate Safety Professional | FEMA | |
| ASPA | Assistant Secretary of Public Affairs | FEMA | |
| ASPE | American Society of Professional Estimators | FEMA | |
| ASPECT | Airborne Spectral Photographic Environmental Collection Technology | FEMA | |
| ASPECT | Airborne Spectral Environmental Collection Technology | S&T | |
| ASPHEP | Assistant Secretary for Public Health Emergency Preparedness | FEMA | |
| ASPRS | American Society of Photogrammetry and Remote Sensing | FEMA | |
| ASR | Aquifer Storage Recovery | FEMA | |
| ASR | Atmosphere supplying respirator | FEMA | |
| ASR | Automatic Sprinkler Riser | FEMA | |
| ASSE | American Society of Safety Engineers | FEMA | |
| ASSET | Advanced Simulation and Software Engineering Technology | FEMA | |
| ASST | Assistant | FEMA | |
| ASSY | Assembly | FEMA | |
| AST | Aboveground Storage Tank | FEMA | |
| AST | Aviation Survival Technician | FEMA | |
| AST | Accessible Systems and Technologies | MGMT | |
| ASTA | American Society of Travel Agents | CBP | |
| ASTHO | Association of State and Territorial Health Officials | FEMA | |
| ASTI | Airport Security Technology Integration | TSA | |
| ASTM | American Society for Testing and Materials | S&T | |
| ASTS | Aeromedical Staging Squadron | FEMA | |
| ASU | All-Source Situational Understanding | FEMA | |
| ASUFAC | Airport and Seaport User Fee Advisory Committee, INS | CBP | |
| AT | Advanced Technology | FEMA | |
| AT | Anti-Terrorism | FEMA | |
| AT&L | Acquisition, Technology and Logistics | FEMA | |
| AT/FP | Anti-Terrorism & Force Protection | FEMA | |
| ATA | Airline Transportation Association | TSA | |
| ATA | Actual Time of Arrival | FEMA | |
| ATA | American Trucking Association | PLCY | |
| ATAC | Anti-Terrorism Advisory Council | I&A | |
| ATB | Applied Technology Board | TSA | |
| ATBM | Air Tanker Base Manager | FEMA | |
| ATC | Applied Technology Council | FEMA | |
| ATC | Air Traffic Control | CBP | TSA | CISA | |
| ATCET | Anti-Terrorism Combat Enforcement Team | CBP | |
| A-TCET | Anti-Terrorism Contraband Enforcement Team | FEMA | |
| ATCO | Air tanker Coordinator | FEMA | |
| ATCT | Air Traffic Control Tower | FEMA | |
| ATD | Actual Time of Departure | FEMA | |
| ATD | Advanced Technology Demonstration | CWMD | |
| ATD | Atmospheric Transport and Dispersion | FEMA | |
| ATDI | Advance Trade Data Initiative | CBP | |
| ATDP | Annual Training and Development Plan | FEMA | |
| ATDT | Atlantic Daylight Time (GMT - 3) | FEMA | |
| ATF | Alcohol, Tobacco, Firearms and Explosives [Bureau of] | DHS | |
| ATGS | Air Tactical Group Supervisor | FEMA | |
| ATH | Air-Transportable Hospital | FEMA | |
| ATIS | Alliance for Telecommunications Industry Solutions | CISA | |
| ATM | Asynchronous Transfer Mode | FEMA | |
| ATM | Automated Teller Machine | FEMA | |
| ATMU | Advanced Technology Meteorological Unit | FEMA | |
| ATMWU | Air Transportable Mobile Weather Unit | FEMA | |
| ATN | Aeronautical Telecommunications Networks | S&T | |
| ATO | Air Tasking Order | FEMA | |
| ATP | Air Transit Program | TSA | |
| ATP | Authority to Participate | FEMA | |
| ATR | Advanced Thermal Reactor | FEMA | |
| ATRAP | Air Transportable RADIAC Package | FEMA | |
| ATS | Automated Targeting System | CBP | PLCY | PRIV | |
| ATSA | Aviation and Transportation Security Act | TSA | CISA | I&A | |
| ATSDR | Agency for Toxic Substance and Disease Registry (USPHS) | CISA | S&T | |
| ATST | Atlantic Standard Time (GMT - 4) | FEMA | |
| ATT | Anti-Terrorism Technologies | FEMA | |
| ATTF | Antiterrorism Task Force | I&A | |
| ATTN | Attention | FEMA | |
| ATV | All-terrain vehicle | CBP | FEMA | |
| ATWC | Alaska Tsunami Warning Center (see WCATWC) | FEMA | |
| AUH | Attached Unit Housing | FEMA | |
| AUSA | Assistant United States Attorney | FEMA | |
| AUTHN | Authorization | FEMA | |
| AUTHY | Authority | FEMA | |
| AUTODIN | Automatic Digital Network | FEMA | |
| AUTOVON | Automatic Voice Network (see DSN) | FEMA | |
| AUVSI | Association for Unmanned Vehicle Systems International | CBP | |
| AV | Air Vehicle | FEMA | |
| AV | Audio-Visual | FEMA | |
| AVC | Alaska Volcano Center | FEMA | |
| AVHRR | Advanced Very High Resolution Radiometer | FEMA | |
| AVI | Audio-Visual Interleave | FEMA | |
| AVIC | Area Veterinarian in Charge | FEMA | |
| AVIP | Anthrax Vaccine Immunization Program | FEMA | |
| AVLIS | Atomic Vapor Laser Isotope Separation | FEMA | |
| AVMA | American Veterinary Medical Association | FEMA | |
| AVO | Alaska Volcano Observatory | FEMA | |
| AVOps | Aviation Operations | TSA | OPS | |
| AVSEC | Aviation Security | TSA | |
| AWACS | Airborne Warning and Control System | CBP | |
| AWBA | Average Weekly Benefit Amount | FEMA | |
| AWD | Available Without Declaration | FEMA | |
| AWIPS | Advanced Weather Interactive Processing System | FEMA | |
| AWIS | Automated Weather Information System | FEMA | |
| AWO | American Waterway Operators | USCG | |
| AWOL | Absent Without Leave | FEMA | |
| AWOP | Absence Without Pay | FEMA | |
| AWRA | American Water Resources Association | FEMA | |
| AWS | Alternate Work Schedule | FEMA | |
| AWS | alternative work schedule | MGMT | |
| AWWA | American Water Works Association | FEMA | |
| AYE | Alternate Year Exercise | FEMA | |
| B&SA | Bureau and Statistical Agent (NFIP) | FEMA | |
| B/C | Benefit/Cost | FEMA | |
| BAA | Broad Agency Announcement | FEMA | S&T | |
| BAA | Broad Area Announcement | FEMA | |
| BACM | Business Alliance for Customs Modernization | CBP | |
| BAER | Burned Area Emergency Rehabilitation (Team) | FEMA | |
| BAER | Burned Area Emergency Response | FEMA | |
| BALV | Best Available Lodging Value | FEMA | |
| BAND | Bio-agent Autonomous Networked Detectors | S&T | |
| BARDA | Biomedical Advanced Research & Development Authority | FEMA | |
| BAREPP | Bay Area Regional Earthquake Preparedness Project | FEMA | |
| BASIS | Biological Aerosol Sentry and Information System | S&T | |
| BATF | Bureau of Alcohol, Tobacco and Firearms | FEMA | |
| BATT | Battery | FEMA | |
| BAWS | Biological Aerosol Warning System | FEMA | |
| BBP | Blood Borne Pathogen | FEMA | |
| BBRS | Board of Building Regulations and Standards | FEMA | |
| BBS | Bulletin Board System | FEMA | |
| BC | Base Camp | FEMA | |
| BC | Branch Chief | FEMA | |
| BCA | Benefit-Cost Analysis | FEMA | |
| BCBP | Bureau of Customs and Border Protection | FEMA | |
| BCC | Border Crossing Card | CBP | PLCY | PRIV | |
| BCF | Billion Cubic Feet | FEMA | |
| BCIS | Bureau for Citizenship and Immigration Services (see USCIS) | FEMA | |
| BCMC | Board for the Coordination of Model Codes | FEMA | |
| BCMG | Base/Camp Manager | FEMA | |
| BCMR | Board of Correction of Military Records | USCG | OGC | |
| BCP | Business Continuity Planning | FEMA | |
| BCR | Benefit-Cost Ratio | FEMA | |
| BCR | Border Cargo Release | CBP | |
| BDA | Battle Damage Assessment | FEMA | |
| BDC | Bomb Data Center (FBI) | CISA | |
| BDE | Brigade | FEMA | |
| BDO | Battle Dress Overgarment | FEMA | |
| BDRP | Biological Defense Research Program | FEMA | |
| BDS | Biohazard Detection System | CISA | |
| BDU | Battle Dress Utility | FEMA | |
| BEA | Bureau of Economic Analysis | FEMA | |
| BEEF | Big Explosive Experimental Facility | FEMA | |
| BEIR | Biological Effects of Ionizing Radiation | FEMA | |
| BENS | Business Executives for National Security | PLCY | |
| BENT SPEAR | Nuclear Incident (codeword) | FEMA | |
| BEP | Budget Execution Plan | FEMA | |
| BERD | Blocked Erosion Rate Database | FEMA | |
| BERT | Building Emergency Response Team | CISA | |
| BEST | Bus Explosive Screening Technology | TSA | |
| BEST | Border Enforcement Security Taskforce | DHS | CBP | ICE | USCG | I&A | OPS | |
| BEST | Building Engagement, Strengths and Talent | FEMA | |
| BFA | Benefit Fraud Assessment | FEMA | |
| BFC | Bills for Collection | FEMA | |
| BFD | Base Flood Depth | FEMA | |
| BFE | Base Flood Elevation | FEMA | |
| BFM | Budget and Financial Management Branch (US-VISIT) | CISA | |
| BGAD | Blue Grass Army Depot | FEMA | |
| BGAN | Broadband Global Area Network | FEMA | |
| BGCA | Blue Grass Chemical Activity | FEMA | |
| BGP | Border Gateway Protocol | FEMA | |
| BHEF | Business-Higher Education Forum | S&T | |
| BHS | Bureau of Health Services | FEMA | |
| BI | Background Investigation | FEMA | |
| BIA | Bureau of Indian Affairs | CISA | CRCL | |
| BIA | Board of Immigration Appeals/Affairs (DOJ) | ICE | USCIS | |
| BICE | Bureau of Immigration and Customs Enforcement | FEMA | |
| BICEP | Basic Investigation of Computer and Electronic Crimes Program | FLETC | |
| BICEPP | Business and Industry Council for Emergency Preparedness and Planning | FEMA | |
| BIDS | Biological Integrated Detection System | FEMA | |
| BIFC | Boise Interagency Fire Center (see NIFC or NIFCC) | FEMA | |
| BIIDB | Badge Imaging Information Database | FEMA | |
| BIL | Band Interleaved by Line (Format) | FEMA | |
| BIO | Biological | FEMA | |
| BIO | biological improvised explosive device enhancement | S&T | |
| BISC | Border Interdiction Support Center | CBP | |
| BIT | Building Inventory Tool | FEMA | |
| BIT | Built-In Test | FEMA | |
| BIT | Business Intelligence Tool | MGMT | |
| BITE | Biometric Identification Technology Ethics | PRIV | |
| BIWG | Bilateral Interdiction Working Group | ICE | |
| BJA | Bureau of Justice Assistance (DOJ) | FEMA | |
| BKC | Biodefense Knowledge Center [Part of NBACC, National Biodefense Analysis and Countermeasures Center] | S&T | |
| BKR | Breaker | FEMA | |
| BL | Bill of Lading | FEMA | |
| BLESTP | Basic Law Enforcement Supervisor Training Program | FLETC | |
| BLEVE | Boiling Liquid Expanding Vapor Explosion | FEMA | |
| BLM | Bureau of Land Management | FEMA | |
| BLS | Bureau of Labor Statistics | MGMT | |
| BLS | Basic Life Support | FEMA | |
| BM | Bench Mark | FEMA | |
| BMBL | Biosafety in Microbiological and Biomedical Laboratories | S&T | |
| BMC | Bomb Management Center | FEMA | |
| BMD | Borders and Maritime Security Division (S&T/BMD) | DHS | |
| BMP | Best Management Practice | FEMA | |
| BMS | Building Management System | FEMA | |
| BN | Battalion | FEMA | |
| BNA | Baseline Needs Assessment | FEMA | |
| BNICE | Biological, Nuclear, Incendiary, Chemical, Explosive | CISA | S&T | |
| BNML | Battalion Military Liaison | FEMA | |
| BOC | Basic Operating Cost | FEMA | |
| BOCA | Building Officials and Code Administrators | FEMA | |
| BOD | Business Operations Services and Human Capital Division (S&T/BOD) | DHS | |
| BOE | basis of estimate | S&T | |
| BOL | Bureau of Labs | FEMA | |
| BOLO | Be On the Lookout alert | I&A | |
| BOM | Bill of Materials | FEMA | |
| BOO | Base of Operations | FEMA | |
| BOP | (Federal) Bureau of Prisons | FEMA | |
| BOR | Bureau of Reclamation | FEMA | |
| BORCAP | Border Patrol Criminal Alien Program | CBP | USCG | OPS | |
| BorderNet | (formerly BTSNet) | CBP | S&T | |
| BORP | Building Occupancy Resumption Program | FEMA | |
| BORSTAR | Border Patrol Search, Trauma and Rescue Team | CBP | USCG | |
| BORTAC | Border Patrol Tactical Unit | CBP | |
| BOV | Board of Visitors | FEMA | |
| BOXER | Bulk-Only X-ray Enhanced Region | TSA | |
| BPA | Border Patrol Agent | CBP | FEMA | OPS | |
| BPAT | Building Performance Assessment Team | FEMA | |
| BPD | Blast-Protective Design | FEMA | |
| BPM | Basic Property Management | FEMA | |
| BPML | Business Process Markup Language | FEMA | |
| BPN | Business Partner Network | FEMA | |
| BPO | Blanket Purchase Order | FEMA | |
| BPP | Business Policy and Planning Branch (US-VISIT) | CISA | |
| BPR | Business Process Reengineering | FEMA | |
| BPRP | Bioterrorism Preparedness and Response Program | FEMA | |
| BPS | Bits Per Second | FEMA | |
| BPSS | Business Process Specification Schema | FEMA | |
| BPWG | Best Practices Working Group | DHS | |
| BRAC | Base Realignment and Closure Act | MGMT | |
| BRASS | Border Release Advance Screening & Selectivity | CBP | |
| BRI | Building Related Illness | FEMA | |
| BRIDGES | Building Respect in Diverse Groups to Enhance Security | ICE | |
| BRM | Bio-Regulator/Modulator | FEMA | |
| BRM | Business Reference Model | I&A | MGMT | |
| BROKEN ARROW | Nuclear Accident (codeword) | FEMA | |
| BRT | Business Round Table | PLCY | |
| BSA | Business Software Alliance | DHS | |
| BSA | Base Support Area | FEMA | |
| BSAT | biological select agent and toxin | CWMD | |
| BSC | Biometrics Support Center | FEMA | CISA | |
| BSCO | Biosafety Coordinating Official | S&T | |
| BSD | Border Security Deployment | CBP | |
| BSE | Bovine Spongiform Encephalopathy (aka: “Mad Cow Disease”) | FEMA | |
| BSI | Basic Support Installation | FEMA | |
| BSI | Border Safety Initiative | CBP | |
| BSIR | Biannual Strategy Implementation Reports | FEMA | |
| BSL | biosafety level | CWMD | |
| BSO | Biosafety Officer | S&T | |
| BSOP | Battle Staff Operating Procedures | FEMA | |
| BSPP | Broadcast Station Protection Program | FEMA | |
| BSSC | Building Seismic Safety Council | FEMA | |
| BST | Border Support Team | CBP | |
| BST | Burn Specialty Team | FEMA | |
| BT | Bioterrorism | FEMA | |
| BT | Buying Team | FEMA | |
| BTA | Bioterrorism Act | CBP | |
| BTA | Border Trade Alliance | CBP | |
| BTCP | Biological Threat Characterization Program | S&T | |
| BTCP | Biological Terrorism Contingency Plan | CISA | S&T | |
| BTO | Business Transformation Office | FEMA | |
| BTS | Budget Tracking System | CISA | |
| BTS | Bureau of Transportation Statistics | TSA | |
| BTS | Border and Transportation Security (former DHS Directorate, contained CBP, ICE, TSA and FLETC) | FEMA | |
| BTU | British Thermal Unit | FEMA | |
| BTW | By the way | DHS | |
| BU | Building (Line) | FEMA | |
| BUMED | Bureau of Medicine | FEMA | |
| BUYL | Buying Team Leader | FEMA | |
| BUYM | Buying Team Member | FEMA | |
| BV | Butterfly Valve | FEMA | |
| BW | Biological Weapons | S&T | |
| BW | Biological Warfare | CISA | S&T | |
| BWIC | Biological Warning and Incident Characterization | FEMA | S&T | |
| BWR | Boiling Water Reactor | FEMA | |
| BY | Budget Year | FEMA | |
| BZ | Breathing Zone | FEMA | |
| BZPP | Buffer Zone Protection Plan | FEMA | |
| BZPP | Buffer Zone Protection Program | FEMA | CISA | |
| C Number | Crew number | FEMA | |
| C&A | certification and accreditation | MGMT | |
| C&C | Components and Cladding | FEMA | |
| C&D | Clean and Disinfect | FEMA | |
| C/A | Controller/Analyst | FEMA | |
| C/E | Communications/Electronics | DHS | |
| C2 | Command and Control | FEMA | |
| C3 | (ICE) Cyber Crimes Center | FEMA | |
| C3 | Command, Control, and Communications | FEMA | USCG | |
| C3 | Customs Cyber Smuggling Center | FEMA | |
| C3I | Command, Control, Communications, Information | FEMA | |
| C3ISR | Command, Control, Communications, Intelligence, Surveillance and Reconnaissance | FEMA | |
| C4 | Command, Control, Communications and Computers | FEMA | OPS | |
| C4ISR | C4+Intelligence, Surveillance and Reconnaissance | USCG | |
| CA | Chemical Agent | S&T | |
| CA | Capability Assurance | FEMA | |
| CA | Civil Affairs | FEMA | |
| CA | Congressional Affairs | FEMA | |
| CA | Cooperating Agency | FEMA | |
| CA | Cooperative Agreement | FEMA | |
| CA | compartmented area | MGMT | |
| CAA | Clean Air Act | FEMA | |
| CAAP | Critical Asset Assurance Program | FEMA | |
| CAARS | Cargo Advanced Automated Radiography System | CWMD | |
| CAB | Change Advisory Board | MGMT | |
| CABIN | Chemical and Biological Information Network | FEMA | |
| CAC | Citizens’ Advisory Commissions | FEMA | |
| CAC | Civil Applications Committee | FEMA | |
| CAC | Climate Analysis Center | FEMA | |
| CAC | Community Assistance Contact | FEMA | |
| CAC | Crisis Action Center | FEMA | |
| CAC | Common Access Card | PLCY | PRIV | |
| CACB | Camp Crew Boss | FEMA | |
| CACTIS | Computer-Assisted CSEPP Training Information System | FEMA | |
| CAD | Computer Aided/Assisted Dispatch | FEMA | |
| CAD | Computer-Aided/Assisted Design | FEMA | |
| CAD | Computer-Assisted Drafting | FEMA | |
| CADD | Computer-Assisted Drafting and Design | FEMA | |
| CADET | Computer-Assisted Design for Exercise Training | FEMA | |
| CADW | Civil Air Defense Warning | FEMA | |
| CAE | Command Assessment Element (for CBIRF) | FEMA | |
| CAE | Component Acquisition Executive | MGMT | |
| CAEM | Committee for Animal Emergency Management | FEMA | |
| CAEO | Competitive Analysis and Evaluation Office | FEMA | |
| CAER | Community Awareness and Emergency Response | FEMA | |
| CAF | Compressed Air Foam | FEMA | |
| CAF | Critical Asset Factor | FEMA | CISA | |
| CAG | Core Agency Group | FEMA | |
| CAI | Chemical Accident/Incident | FEMA | |
| CAI | Computer-Aided Instruction | FEMA | |
| CAIC | Chemical Accident/Incident Control | FEMA | |
| CAICO | Chemical Accident/Incident Control Officer | FEMA | |
| CAIRA | Chemical Accident/Incident Response and Assistance | FEMA | |
| CALM | Cognitive and Affective Learning Model | FEMA | |
| CAM | Chemical Agent Monitor | FEMA | S&T | |
| CAM | Computer-Aided Manufacturing | FEMA | |
| CAMDS | Chemical Agent Munition Disposal System | FEMA | |
| CAMEO | Computer-Aided Management of Emergency Operations | FEMA | |
| CAMEXPAN | Central America, Mexico, Panama | CBP | PLCY | |
| CAMPS | Civil Aircraft Missile Protection System | CISA | S&T | |
| CAMRA | Center for Advancing Microbiological Risk Assessment | S&T | |
| CAMS | Continuous Air Monitoring System | FEMA | |
| CAMU | Corrective Action Management Unit | DHS | |
| CAMU | Companion Animal Management Unit | FEMA | |
| CANAR | Consortia of Administrators for Native American Rehabilitators | FEMA | |
| CANDU | Canadian-Deuterium Uranium (Reactor) | FEMA | |
| CAO | Component Chief Administrative Officer | DHS | |
| CAO | Caribbean Area Office | FEMA | |
| CAO | Chief Administrative Officer | DHS | |
| CAP | 1Criminal Alien Program | FEMA | |
| CAP | Capability Assessment Program | FEMA | |
| CAP | Capability Assurance Program | FEMA | |
| CAP | Civil Air Patrol | CBP | FEMA | |
| CAP | Collection, Analysis and Planning | FEMA | |
| CAP | Combat Air Patrol | FEMA | |
| CAP | Common Alerting Protocol | FEMA | |
| CAP | Community Assistance Program | FEMA | |
| CAP | Contract Administration Plans | FEMA | |
| CAP | Corrective Action Program | FEMA | |
| CAP | Crisis Action Process | OPS | |
| CAPA | Coalition of Airline Pilots Association | TSA | |
| CAPC | Civil Aviation Planning Committee | FEMA | |
| CAPCO | Controlled Access Program Coordination Office | I&A | |
| CAP-FASSE | Corrective Action Program - Federal Agency Support Services Element | FEMA | |
| CAPM | Compliance Assurance Program Manager | CWMD | |
| CAPPS II | Computer Assisted Passenger Pre-screening System | TSA | PLCY | PRIV | |
| CAPR | Categorical Assistance Progress Reports | FEMA | |
| CAPRA | Critical Asset and Portfolio Risk Analysis | CISA | |
| CAPSS | Corrective Action Program Support System | FEMA | |
| CAP-SSSE | Corrective Action Program - State Support Services Element | FEMA | |
| CapWIN | Capital Wireless Integrated Network | FEMA | |
| CAR | Capability Assessment for Readiness | FEMA | |
| CAR | Congressional Affairs Representative | FEMA | |
| CARAT | Cooperation Afloat Readiness and Training | USCG | |
| CARCAH | Chief, Aerial Reconnaissance Coordination -All Hurricanes | FEMA | |
| CARD | Collaborative Agencies for Responding to Disasters | FEMA | |
| CARDA | Continental Airborne Reconnaissance for Damage Assessment | FEMA | |
| CARL | Computerized Activities Results List | FEMA | |
| CARRI | Community and Regional Resilience Initiative | S&T | |
| CART | Computer Analysis and Response Team | FEMA | |
| CART | County Animal Response Team | FEMA | |
| CARVER | Criticality, Accessibility, Recuperability, Vulnerability, Effect and Recognizability | CISA | |
| CAS | Chemical Abstract Service | FEMA | |
| CAS | Comprehensive Assessment System | FEMA | |
| CAS | Crisis Action System | FEMA | |
| CASC | Cache Supply Clerk | FEMA | |
| CASE | Computer Aided Software Engineering | I&A | MGMT | |
| CASPER | C-130 Airborne Sensor with Palletized Electronic Reconnaissance | USCG | |
| CASS | Cockpit Access Security System | TSA | |
| CAST | Commercial Aviation Safety Team | TSA | |
| CASU | Centralized Administrative Services Unit | FEMA | |
| CAT | Catalog | FEMA | |
| CAT | Collier Area Transit (Florida) | FEMA | |
| CAT | Catastrophic | FEMA | |
| CAT | Category | FEMA | |
| CAT | Crisis Action Team | FEMA | OPS | |
| CATEGORY A [PUBLIC ASSISTANCE] | Debris Removal | FEMA | |
| CATEGORY B [PUBLIC ASSISTANCE] | Emergency Protective Measures | FEMA | |
| CATEGORY C [PUBLIC ASSISTANCE] | Roads and Bridges | FEMA | |
| CATEGORY D [PUBLIC ASSISTANCE] | Water Control Facilities | FEMA | |
| CATEGORY E [PUBLIC ASSISTANCE] | Buildings and Contents | FEMA | |
| CATEGORY F [PUBLIC ASSISTANCE] | Utilities | FEMA | |
| CATEGORY G [PUBLIC ASSISTANCE] | Parks, Recreational, and Other | FEMA | |
| CATEX | Catastrophic Exercise | FEMA | |
| CATEX | Categorical Exclusion | FEMA | |
| CATF | Catastrophic Task Force | FEMA | |
| CATL | Chronology and Time Line | FEMA | |
| CATS | Consequences Assessment Tool Set | FEMA | |
| CAV | Community Assistance Visit | FEMA | |
| CAX | Capability Assurance Exercise | FEMA | |
| CAX | Computer-Assisted Exercise | FEMA | |
| CB | Chemical/Biological, (split) | FEMA | S&T | |
| CB | Citizens' Band | FEMA | S&T | |
| CB | Cluster Bomb | FEMA | S&T | |
| CBA | Cost Benefit Analysis | I&A | MGMT | |
| CBARS | Coastal Barrier Resources System | FEMA | |
| CBCF | Cross Border Crime Forum | CBP | |
| CBCT | Chemical/Biological Countermeasures Training | FEMA | |
| CBD | Chemical and Biological Defense | FEMA | |
| CBD | Chemical and Biological Division (S&T/CBD) | DHS | |
| CBDCOM | Chemical and Biological Defense Command (see SBCCOM) | FEMA | |
| CBEFF | Common Biometric Exchange Formats Framework | FEMA | |
| CBEK | Compendium of Basic Exercise Knowledge | FEMA | |
| CBEP | Career Builder Express Program | FEMA | |
| CBET | Computer Based Education and Training | FEMA | |
| CBI | Chandler Burning Index | FEMA | |
| CBI | Computer-Based Instruction | FEMA | |
| CBIA | Coastal Barrier Improvement Act | FEMA | |
| CBIAC | Chemical and Biological Information Analysis Center | FEMA | |
| CBIG | Caribbean Border Interagency Group | FEMA | |
| CBIRF | Chemical/Biological Incident Response Force (USMC) | FEMA | |
| CBL | Commercial Bill of Lading | FEMA | |
| CBL | Computer-Based Learning | FEMA | |
| CBN | Cooperative Base Network | FEMA | |
| CBN | Chemical, Biological, or Nuclear | FEMA | CISA | S&T | |
| CBO | Congressional Budget Office | USCIS | CISA | |
| CBO | Community-Based Organization | USCIS | CISA | OPS | |
| CBP | Customs and Border Protection, United States | DHS | |
| CBP | U.S. Customs and Border Protection | MGMT | |
| CBPMO | United States Customs and Border Protection Modernization Office | CBP | |
| CBPO | CBP Officer | FEMA | |
| CBQRF | Chemical-Biological Quick Response Force | FEMA | |
| CBR | Chemical, Biological and/or Radiological | CISA | S&T | |
| CBR&D | Chemical and Biological Research and Development Sector | TSA | |
| CBRA | Coastal Barrier Resources Act of 1982 (see COBRA) | FEMA | |
| CBRD | Chemical, Biological and Radiological Defense | FEMA | |
| CBRDEC | Chemical & Biological, Research, Development & Engineering Center | FEMA | |
| CBRDT | Chemical/Biological Rapid Deployment Team | FEMA | S&T | |
| CBRN | Chemical, Biological, Radiological, and Nuclear | FEMA | S&T | |
| CBRNE | Chemical, Biological, Radiological, Nuclear and Explosive | S&T | OPS | |
| CBRNE-CM | Chemical, Biological, Radiological, Nuclear, or High-Yield Explosive - Consequence Management | FEMA | |
| CBRRT | Chemical & Biological Rapid Response Team | FEMA | |
| CBRS | Coastal Barrier Resources System | FEMA | |
| CBRS | Concept Based Requirement System | FEMA | |
| CBRT | Chemical and Biological Response Team | FEMA | |
| CBRTA | Chemical, Biological and Radiological Technology Alliance | S&T | CWMD | |
| CBSA | Canada Border Security Agency | FEMA | |
| CBT | Chemical Biological Toxin | FEMA | |
| CBT | Computer-Based Training | FEMA | |
| CBW | Chemical and Biological Warfare | FEMA | |
| CC | Citizen Corps | FEMA | |
| CC | Congregate Care | FEMA | |
| CC | Coordination Center | FEMA | |
| CC | Courtesy Copy | FEMA | |
| CC | Crisis Counseling | FEMA | |
| cc | cubic centimeter | FEMA | |
| CC | Command Center | PLCY | |
| CCA | Circuit Card Assembly | FEMA | |
| CCA | Comprehensive Cooperative Agreement (see CA) | FEMA | |
| CCA | Continuity Communications Architecture | FEMA | |
| CCAM | Coordinating Council on Access and Mobility | FEMA | |
| CCAMS | Comprehensive Cooperative Agreement Monitoring System | FEMA | |
| CCAP | Child Citizenship Act Project | USCIS | |
| CCAT | Center for Commercialization of Advanced Technology | FEMA | |
| CCB | Configuration Control Board | FEMA | |
| CCC | Citizen Corps Council | FEMA | |
| CCC | Congregate Care Center | FEMA | |
| CCC | Crisis Coordination Center | FEMA | |
| CCD | Corporate Communications Division (S&T&CCD) | DHS | |
| CCD | Consular Consolidated Database | USCIS | I&A | PLCY | PRIV | |
| CCDB | Consolidated Counterdrug Data Base | ICE | |
| CCDPH | Cook County Department of Public Health | FEMA | |
| CCF | Coded Cities Forecast | FEMA | |
| CCFP | (National Institute of Justice) Center for Civil Force Protection | FEMA | |
| CCG | Crisis Coordination Group | FEMA | |
| CCI | Command, Control, and Interoperability | FEMA | |
| CCIO | Command and Control Incidents Operations | FEMA | |
| CCIR | Commander's Critical Information Report | FEMA | |
| CCITP | Counterterrorism Cyber-crime Investigations Training Program | FLETC | |
| CCITT | Consultative Committee for International Telephony and Telegraphy | FEMA | |
| CCL | Contamination Control Line | FEMA | |
| CCLS | Command Center Liaison Section | FEMA | |
| CCMIS | Crisis Consequence Management Information System | FEMA | |
| CCMRF | CBRNE Consequence Management Response Force | FEMA | |
| CCN | Canonical Correlation Analysis | FEMA | |
| CCND | Consultative Committee on Natural Disasters | FEMA | |
| CCO | Claims Coordinating Office | FEMA | |
| CCO | Consultation Coordination Officer | FEMA | |
| CCP | Casualty Collection Point | FEMA | |
| CCP | Crisis Counseling Program | FEMA | |
| CCP | Citizen Corps Program | FEMA | CISA | |
| CCRF | Commissioned Corps Readiness Force | FEMA | |
| CCS | Congregate Care System | FEMA | |
| CCS | Contamination Control Station | FEMA | |
| CCSL | Command and Control Simulation Lab | FEMA | |
| CCSO | Cook County Sheriff's Office | FEMA | |
| CCSO | Component Chief Security Officer | MGMT | |
| CCSP | Certified Cargo Screening Program | FEMA | |
| CCST | Chemical Casualty Site Team | FEMA | |
| CCT | Critical Care Transport | FEMA | |
| CCT | Communications Coordination Team | MGMT | |
| CCTV | Closed Circuit Television | FEMA | |
| CCU | Correspondence Control Unit | FEMA | |
| CCV | Characteristics and Common Vulnerabilities | FEMA | |
| CD | Civil Defense | FEMA | |
| CD | Code | FEMA | |
| CD | Compact Disc | FEMA | |
| CDBG | Community Development Block Grant | FEMA | |
| CDC | Centers for Disease Control and Prevention | DHS | |
| CDCP | Center for Disease Control and Prevention | FEMA | |
| CDD | Capability Development and Demonstration | FEMA | |
| CDD | Cross-Disaster Database | FEMA | |
| CDE | Committed Dose Equivalent | FEMA | |
| CDER | Computer Data Entry Recorder | FEMA | |
| CDERA | Caribbean Disaster Emergency Response Agency | FEMA | |
| CDEX | Civil Defense Exercise | FEMA | |
| CDL | Commercial Driver’s License | FEMA | |
| CDL | Community Disaster Loan | FEMA | |
| CDM | Content Design Manager | FEMA | |
| CDM | conceptual data model | MGMT | |
| CDMA | Code Division Multiple Access | FEMA | |
| CDO | Central Dense Overcast | FEMA | |
| CDP | Candidate Development Program | USCG | |
| CDP | Center for Domestic Preparedness | FEMA | |
| CDP | Chemical Demilitarization Program | FEMA | |
| CDR | Christian Disaster Response | FEMA | |
| CDR | Critical Design Review | FEMA | |
| CDR | Crude Death Rate | FEMA | |
| CDR | Commander | DHS | |
| CDRDB | Conventional Disaster Resource Database | FEMA | |
| CDRG | Catastrophic Disaster Response Group | FEMA | OPS | |
| CDRG-PAC | Catastrophic Disaster Response Group - Primary Agency Committee | FEMA | |
| CD-ROM | Compact Disk Read Only Memory | DHS | |
| CDRS | Call Detail Reporting System | FEMA | |
| CDS | Charge Data System | FEMA | |
| CDSO | Collateral Duty Safety Officer | FEMA | |
| CDSP | Cache Demobilization Specialist | FEMA | |
| CDT | Central Daylight Time (GMT - 5) | FEMA | |
| CDU | Contagious Disease Unit | FEMA | |
| CDV | Civil Defense Victoreen | FEMA | |
| CDX | Control and Direction Exercise | FEMA | |
| CE | Categorical Exclusion | FEMA | |
| CE | Civil Engineer | FEMA | |
| CE | continuous evaluation [security] | MGMT | |
| CEA | County Executives of America | FEMA | CISA | |
| CEA | cost-effectiveness analysis | PLCY | |
| CEA | Council of Economic Advisors | DHS | |
| CEB | Contractor Evaluation Board | FEMA | |
| CEC | Chief Exercise Controller | FEMA | |
| CED | Committee for Economic Development | FEMA | |
| CEDAP | Commercial Equipment Direct Assistance Program | FEMA | |
| CEDE | Committed Effective Dose Equivalent | FEMA | |
| CEE | Consolidated Enforcement Environment | MGMT | |
| CEEP | Critical Employee Emergency Planning | FEMA | |
| CEF | Cost Estimating Format | FEMA | |
| CEF | Critical Emergency File | FEMA | |
| CEG | Council for Excellence in Government | S&T | |
| CEI | Critical Elements of Information | FEMA | |
| CEM | Certified Emergency Manager | FEMA | |
| CEM | Comprehensive Emergency Management | FEMA | |
| CEMD | County Emergency Management Director | FEMA | |
| CEMIS | Crisis and Emergency Management Information System | FEMA | |
| CEMP | Comprehensive Emergency Management Plan | FEMA | |
| CEMS | Continuous Emission Monitoring System | FEMA | |
| CENL | Chemical Event Notification Level | FEMA | |
| CENR | Committee on Environment and Natural Resources | FEMA | |
| CEO | Chief Executive Officer | FEMA | |
| CEO | Community Education and Outreach | FEMA | |
| CEOC | County Emergency Operations Center | FEMA | |
| CEOS | Committee on Earth-Orbiting Satellites | FEMA | |
| CEP | Circular Error Probable | FEMA | |
| CEP | Civil Emergency Planning (NATO) | FEMA | |
| CEP | Civil Emergency Preparedness | FEMA | |
| CEPAP | Cost Estimating for the Public Assistance Program, Expert Panel on | FEMA | |
| CEPI | Catastrophic Emergency Preparedness Initiative | FEMA | |
| CEPPO | Chemical Emergency Preparedness and Prevention Office | FEMA | |
| CEQ | Council on Environmental Quality | FEMA | |
| CERC | Coastal Engineering Research Center | FEMA | |
| CERC | Crisis and Emergency Risk Communication | FEMA | |
| CERCLA | Comprehensive Environmental Response, Compensation, and Liability Act (aka: “Superfund”) | FEMA | |
| CERDEC | Communications-Electronics Research Development and Engineering Center | CWMD | |
| CERES | California Environmental Resources Evaluation System | FEMA | |
| CERT | Computer Evidence Recovery Training | USSS | |
| CERT | Community Emergency Response Team | FEMA | CISA | OPS | |
| CERT | Computer Emergency Recovery Team | FEMA | |
| CERT | Computer Evidence Response Training | FEMA | |
| CERT | Council of Energy Resource Tribes | FEMA | |
| CERT | Computer Emergency Readiness Team | CISA | S&T | |
| CERT/CC | Computer Emergency Response Team/Coordination Center | FEMA | |
| CEST | Cyber Emergency Support Team | FEMA | |
| CET | Contraband Enforcement Team | CBP | OPS | |
| CEU | Compliance Enforcement Unit | CBP | |
| CEU | Continuing Education Unit | FEMA | |
| CEXS | Cooperative Extension Service | FEMA | |
| CFA | Capability Focus Area | FEMA | |
| CFA | Cognizant Federal Agency | FEMA | |
| CFA | Computerized Fleet Analysis | FEMA | |
| CFAI | Commission on Fire Accreditation International | FEMA | |
| CFAO | Cognizant Federal Agency Official | FEMA | |
| CFATS | Chemical Facility Antiterrorism Standards | CISA | |
| CFBCI | Center for Faith Based and Community Initiatives (FEMA/CFBCI) | DHS | |
| CFC | Combined Federal Campaign | MGMT | |
| CFC-NCA | Combined Federal Campaign of the National Capital Area | FEMA | |
| CFDA | Catalog of Federal Domestic Assistance | MGMT | |
| CFGDP | Crash Feed Grain Donation Program | FEMA | |
| CFI | Credentialing Framework Initiative | PLCY | |
| CFIUS | Committee on Foreign Investment in the United States | CISA | I&A | OGC | PLCY | |
| CFIVSAC | Commercial Fishing Industry Vessel Safety Advisory Committee | USCG | |
| cfm | cubic feet per minute | FEMA | |
| CFO | Chief Financial Officer | DHS | |
| CFO | Chief of Field Operations | FEMA | |
| CFO Council | Chief Financial Officer’s Council | DHS | |
| CFR | Code of Federal Regulations | FEMA | OGC | |
| CFS | Certified Fraud Specialists, Association of | USSS | |
| cfs | Cubic Feet Per Second | FEMA | |
| CFSA | Consolidated Farm Service Agency | FEMA | |
| CFSI | Congressional Fire Services Institute | FEMA | |
| CFT | cross functional team | S&T | |
| CFTC | Commodity Futures Trading Commission | PLCY | |
| CG | Coast Guard (see USCG) | FEMA | |
| CG | Commanding General | FEMA | |
| CGD | Coast Guard District | FEMA | |
| CGFAA | Cerro Grande Fire Assistance Act | FEMA | |
| CGI | Common Gateway Interface | FEMA | |
| CGISS | Center for Geophysical Investigation of the Shallow Subsurface | FEMA | |
| CGM | Computer Graphics Metafile | FEMA | |
| CGS | Council of Graduate Schools | USCIS | S&T | |
| CH | Channel | FEMA | |
| CHARM | Complex Hazardous Release Model | FEMA | |
| CHAWS | Chemical Hazard Warning System | FEMA | |
| CHCO | Chief Human Capital Officer (MGMT/CHCO) | DHS | |
| CHDS | Center for Homeland Defense and Security | FEMA | |
| ChE | Cholinesterase | FEMA | |
| CHECK 21 | Check Clearing for the 21st Century Act | FEMA | |
| CHEMTREC | Chemical Transportation Emergency Center | FEMA | |
| CHERCAP | Comprehensive HAZMAT Emergency Response Capability Assessment Program | FEMA | |
| CHER-CAP | Community Hazards Emergency Response - Capability Assurance Process | FEMA | |
| CHIP | Capability and Hazard Identification Program | FEMA | |
| CHIP | Critical Homeland Infrastructure Protection | FEMA | |
| CHM | Chemistry of Hazardous Materials | FEMA | |
| CHPPM | Center for Health Promotion and Preventive Medicine (United States Army) | S&T | |
| CHRCL | Center for Human Rights and Constitutional Law | CRCL | |
| CHRIS | Chemical Hazard Response Information System | FEMA | |
| CHS | Correctional Health Services | FEMA | |
| CI | Critical Infrastructure | FEMA | |
| CI | counterintelligence | I&A | |
| CIA | Catastrophic Incident Annex | FEMA | |
| CIA | Central Intelligence Agency | DHS | |
| CIAD | Congressional and Intergovernmental Affairs Division | FEMA | |
| CIAETP | Criminal Investigation in Automated Equipment Training Program | FLETC | |
| CIAO | Chief Infrastructure Assurance Officer | FEMA | |
| CIAO | Critical Infrastructure Assurance Office | FEMA | CISA | I&A | |
| CIAO | Critical Infrastructure Assurance Officer | FEMA | |
| CICAD | Center for Intelligence Collection Analysis and Dissemination | FEMA | |
| CICC | DHS Counterintelligence Coordinating Council | I&A | |
| CICG | Critical Infrastructure Coordination Group | FEMA | |
| CID | Command, Control and Interoperability Division (S&T/CID) | DHS | |
| CID | Criminal Investigation Division or Department, (split) Community Identification | FEMA | USSS | |
| CIDCON | Civil Defense Condition | FEMA | |
| CIDER | Computer Interactive Display, Entry, and Retrieval | FEMA | |
| CIEE | Common Information Exchange Environment | FEMA | |
| CIF | Central Information File | FEMA | |
| CIF | Cost, Insurance, and Freight | FEMA | |
| CIG | Central Intelligence Group | FEMA | |
| CIH | Certified Industrial Hygienist | FEMA | |
| CII | Critical Infrastructure Information | CISA | |
| CIIA | Critical Infrastructure Information Act of 2002 | CISA | |
| CIID | Counterintelligence and Investigations Division (DHS) | FEMA | |
| CIII | Critical Infrastructure Interdependencies Integrator | CISA | |
| CIIMS | Critical Infrastructure Inspection Management System | S&T | |
| CIIP | Critical Infrastructure Information Protection Interagency Working Group | CISA | |
| CIIP IWG | Critical Information Infrastructure Protection Interagency Working Group | FEMA | |
| CIK | Crypto-Ignition Key | FEMA | |
| CIKR | Critical Infrastructure and Key Resources | CISA | I&A | |
| CIMA | Channel Industry Mutual Aid | FEMA | |
| CIMRT | Critical Incident Management Response Team | FEMA | |
| CIMS | Correspondence and Issues Management System | FEMA | |
| CIMS | Critical Incident Management Support | FEMA | |
| CIMS | Critical Infrastructure Modeling System | CISA | |
| CIMST | Critical Incident Management Support Team | FEMA | |
| CINC | Commander in Chief | FEMA | |
| CINCAMC | Commander-in-Chief, Air Mobility Command | FEMA | |
| CINCLANT | Commander-in-Chief, Atlantic Fleet | FEMA | |
| CINCNORAD | Commander-in-Chief, North American Aerospace Defense Command | FEMA | |
| CINCPAC | Commander-in-Chief, Pacific Command | FEMA | |
| CINCSOC | Commander-in-Chief, Special Operations Command | FEMA | |
| CINCTRANS | Commander-in-Chief, Transportation Command | FEMA | |
| CIND | Compact Integrated Narcotics Detector | USCG | |
| CINDI | Center for Integration of Natural Disaster Information | FEMA | |
| CINDI | Compact Integrated Narcotics Detector Instrument | FEMA | |
| CINS | Catastrophic Incident of National Significance | FEMA | |
| CINT | Chief Intelligence Officer | I&A | |
| CIO | Chief Information Officer | DHS | |
| CIP | Critical Infrastructure Protection | CISA | S&T | I&A | |
| CIP | Component Intelligence Program | I&A | |
| CIP | capital investment plan | MGMT | |
| CIP IWG | Critical Infrastructure Protection Interagency Working Group | FEMA | |
| CIPAC | Critical Infrastructure Partnership Advisory Council | S&T | I&A | |
| CIPB | Critical Infrastructure Protection Board | FEMA | |
| CIP-DSS | CIP-Decision Support System | FEMA | |
| CIPIC | Critical Infrastructure Protection Information Center | FEMA | |
| CIPP | Certified Information Privacy Professionals | CISA | PRIV | |
| CIPWG | Critical Infrastructure Protection Working Group | FEMA | |
| CIR | Critical Infrastructure Resiliency | FEMA | |
| CIRA | Catastrophic Incident Response Annex | FEMA | |
| CIRES | Catastrophic Incident Response Execution Schedule | FEMA | |
| CIRG | Critical Incident Response Group | FEMA | |
| CIRMS | Council of Ionizing Radiation Measurements and Standards | FEMA | |
| CIRP | Catastrophic Incident Response Plan | FEMA | PLCY | |
| CIS | Catastrophic Incident Supplement | FEMA | |
| CIS | Central Index System | CBP | USCIS | |
| CIS | Community Information System | FEMA | |
| CIS | Civil Infrastructure Security | CISA | S&T | |
| CIS | see USCIS for Citizenship and Immigration Services | USCIS | |
| CISA | Cybersecurity and Infrastructure Security Agency | CISA | |
| CISD | Critical Incident Stress Debriefing | FEMA | |
| CISM | Critical Incident Stress Management | FEMA | |
| CISMT | Critical Incident Stress Management Team | FEMA | |
| CISO | Chief Information Security Officer | I&A | MGMT | |
| CISOMB | Citizenship and Immigration Services Ombudsman | DHS | |
| CISSC | Central Information Systems Storage Center | FEMA | |
| CITAC | Computer Intrusion Threat Assessment Center | FEMA | |
| CITMO | Commercial Information Technology for Multinational Operations | S&T | |
| CITP | Criminal Investigator Training Program | FLETC | |
| CJCS | Chairman of the Joint Chiefs of Staff | FEMA | |
| CJIS | Criminal Justice Information Services | CBP | PLCY | PRIV | |
| CJTF | Commander, Joint Task Force | FEMA | |
| CK | Caulk | FEMA | |
| CLAIMS | Computer Linked Application Information Management System | USCIS | I&A | PLCY | PRIV | |
| CLASP | Consular Lost and Stolen Passport System | I&A | PLCY | PRIV | |
| CLASS | Consular Lookout and Support System | I&A | PLCY | PRIV | |
| CLDC | Connected Limited Device Configuration | FEMA | |
| CLIA | Civil Liberties Impact Assessment | CRCL | |
| CLIVAR | Climate Variability | FEMA | |
| CLMS | Claims Specialist | FEMA | |
| CLO | Chief Logistics Officer | FEMA | |
| CLO | Congressional Liaison Officer | FEMA | |
| CLOMA | Conditional Letter of Map Amendment | FEMA | |
| CLOMR | Conditional Letter of Map Revision | FEMA | |
| CLR | Common Language Runtime | FEMA | |
| CLS | Central Locator System | FEMA | |
| CM | Cadre Manager | FEMA | |
| cm | centimeter | FEMA | |
| CM | Chief of Mission | FEMA | |
| CM | Configuration Management | FEMA | |
| CM | Consequence Management | FEMA | |
| CM | Counter-Measure | FEMA | |
| CMA | Certified Medical Assistant | FEMA | |
| CMA | Chemical Manufacturers Association | FEMA | |
| CMA | Chemical Materials Agency | FEMA | |
| CMA | Community Map Action (Form) | FEMA | |
| CMAA | Customs Mutual Assistance Agreement | CBP | |
| C-MANPADS | Counter-Man-Portable-Air-Defense Systems | FEMA | |
| CMAS | Circular Map Accuracy Standard | FEMA | |
| CMAS | Commercial Mobile Alert System | FEMA | |
| CMAT | Consequence Management Advisory Team | FEMA | |
| CMC | Center for Marine Conservation | FEMA | |
| CMC | Crisis Management Center | FEMA | |
| CMC | Crisis Management Coordinator | FEMA | |
| CMC | Customs Management Centers | CBP | |
| CMCAC | Crisis Management Center Augmentation Cadre | FEMA | |
| CME | Chief Medical Examiner | FEMA | |
| CME | Continuing Medical Education | FEMA | |
| CMF | Case Management File | FEMA | |
| CMG | Consequence Management Group | FEMA | |
| CMHS | Center for Mental Health Services | FEMA | |
| CMIA | Cash Management Improvement Act | FEMA | |
| CMIR | Currency and Monetary Instruments Report | I&A | |
| CMIS | Corporate Management Information System | FEMA | |
| CML | Commercial | FEMA | |
| CMM | Capability Maturity Model | I&A | MGMT | |
| CMMI | Capability Maturity Model Integration | FEMA | |
| CMO | Civil Military Operations | FEMA | |
| CMO | Chief Medical Officer | CWMD | |
| CMOC | Civil Military Operations Center | FEMA | |
| CMRT | Consequence Management Response Team | FEMA | |
| CMS | Call Management System | FEMA | |
| CMS | Crisis Management System | FEMA | |
| CMS | Centers for Medicare and Medicaid Services | MGMT | |
| CMT | Crisis Management Team | FEMA | TSA | |
| CMTB | Countermeasures Test Bed | S&T | |
| CMU | Concrete Masonry Unit | FEMA | |
| CMU | Crisis Management Unit | FEMA | |
| CMV | Commercial Motor Vehicle | FEMA | |
| CMX | Crisis Management Exercise | FEMA | |
| CN | Communications Network | FEMA | |
| CNA | Certified Nursing Assistant | FEMA | |
| CNAC | Customs National Aviation Center | FEMA | |
| CNBC | Congress of National Black Churches | FEMA | |
| CNC | Central Network Control | FEMA | |
| CNC | Computer Numerical Control | FEMA | |
| CNCS | Corporation for National and Community Service | DHS | |
| CNDSP | Computer Network Defense Service Provider | FEMA | |
| CNE | Counternarcotics Enforcement, Office of (formerly CNO) | DHS | |
| CNGB | Chief of the National Guard Bureau | FEMA | |
| CNIES | Cooperating Nations Information Exchange System | DHS | CBP | USCG | OPS | |
| CNMI | Commonwealth of the Northern Mariana Islands | FEMA | |
| CNN | Cable News Network | FEMA | |
| CNO | Chief of Naval Operations | USCG | |
| CNO | Counter-Narcotics Office (see CNE) | FEMA | |
| CNO | Counternarcotics Officer | ICE | |
| CNPPD | Chemical & Nuclear Preparedness and Protection Division | FEMA | |
| CNR | Center for National Response, The | FEMA | |
| CNS | Central Nervous System | FEMA | |
| CNS | Corporation for National Security | DHS | |
| CNSC | Canadian Nuclear Safety Commission | DHS | |
| CNSIP | Classified National Security Information Program | MGMT | |
| CNSNS | Commission for Nuclear Safety and Safeguards | FEMA | |
| CNT | Counternarcoterrorism | ICE | |
| CNT | Crisis Negotiation Team | FEMA | |
| CNU | Crisis Negotiations Unit (FBI) | FEMA | |
| CNWDI | Critical Nuclear Weapons Design Information | FEMA | |
| CO | Commanding Officer | FEMA | |
| CO | Communications Officer | FEMA | |
| CO | Contracting Officer | FEMA | |
| CO | Custodial Officer | FEMA | |
| CO2 | Carbon Dioxide | FEMA | |
| COA | Course of Action | FEMA | |
| COAC | Customs Operations Advisory Committee | CBP | |
| COAD | Community Organizations Active In Disaster | FEMA | |
| COAP | Center for Ocean Analysis and Prediction | FEMA | |
| COB | Close of business | DHS | |
| COBOL | Common Business-Oriented Language | FEMA | |
| COBRA | Chemical, Ordnance, Biological, Radiological | FEMA | |
| COBRA | Coastal Barriers Resources Act | FEMA | |
| COBRE | Carry-On Bag Remote Examination | TSA | |
| COC | Combat Operations Center | FEMA | |
| COC | Country of Citizenship | CBP | ICE | |
| COCO | Computer Coordinator | FEMA | |
| COCOM | Combatant Command | FEMA | |
| COCOM | Coordinating Committee | FEMA | |
| COD | Cash on Delivery | FEMA | |
| CODEL | Congressional Delegation | TSA | |
| CODIS | Combined DNA Index System | I&A | PLCY | PRIV | |
| COE | US Army] Corps of Engineers (see USACE) | FEMA | |
| COE | Center of Excellence | S&T | MGMT | |
| COEM | Chicago Office of Emergency Management | FEMA | |
| COF | Construction of Facilities projects | FEMA | |
| COG | Continuity of Government | FEMA | |
| COG | Council of Governments | FEMA | |
| COGCON | Continuity of Government Readiness Conditions System | I&A | |
| COGO | Coordinate Geometry | FEMA | |
| COI | Community of Interest | DHS | |
| COI | Critical Operational Issue | FEMA | |
| COL | Colonel | FEMA | |
| COL | Cost of Living | FEMA | |
| COLA | Combined Operating License Application | FEMA | |
| COLA | Cost of Living Allowance | FEMA | |
| COLISEUM | Community On-Line Intelligence System for End Users and Managers | CISA | |
| COLT | Cellular on Light Truck | FEMA | |
| COM | Communications | FEMA | |
| COM | Component Object Model | FEMA | |
| COMC | Communications Coordinator | FEMA | |
| COMCDTF | Commander, Civil Disturbance Task Force | FEMA | |
| COMINT | Communications Intelligence | FEMA | |
| COML | Communications Unit Leader | FEMA | |
| COMM | Communications | FEMA | |
| COMMDIR | Communications Directory | FEMA | |
| CoMNET | Consequence Management News, Equipment and Training | FEMA | |
| COMP | Compensation/Claims Unit Leader | FEMA | |
| COMPUSEC | Computer Security | FEMA | |
| COMREL | Community Relations | FEMA | |
| COMSEC | Communications Security | I&A | MGMT | |
| COMSVC | Component Services (OHA/COMSVC) | DHS | |
| CONG | Congressional | FEMA | |
| CONGR | Congress | FEMA | |
| CONO | Contracting Officer | FEMA | |
| CONOPS | Concept of Operations | DHS | |
| CONOPS | Control Operations | FEMA | |
| CONPLAN | Concept of Operations Plan | FEMA | |
| CONPLAN | Contingency Plan | FEMA | |
| CONPLAN | United States Government Interagency Domestic Terrorism Concept of Operations Plan (see NRP) | FEMA | |
| CONUS | Contiguous United States | FEMA | |
| CONUS | Continental United States | FEMA | |
| CONUSA | Continental United States Army | FEMA | |
| COO | Chief Operating Officer | FEMA | |
| COO | continuity of operations | MGMT | |
| COOP | Continuity of Operations | FEMA | CISA | |
| COOP | Continuity of Operations Plan | MGMT | |
| COP | Chief of Party | FEMA | |
| COP | Chief of Police | FEMA | CISA | |
| COP | Committee of Principals | FEMA | |
| COP | Common Operating/Operational Picture | FEMA | |
| COP | Continuation of Pay | FEMA | |
| COP | community of practice | DHS | |
| COPS | Community Oriented Policing Service | FEMA | |
| COR | Central Office of Record | FEMA | |
| COR | Contracting Officers Representative | FEMA | |
| CORBA | Common Object Request Broker Architecture | FEMA | |
| C-ORD | commercialization operational requirements document | S&T | |
| CORE | Cadre of On-call Response Employees | FEMA | |
| CORE | Cadre of Response Employees | FEMA | MGMT | OPA | |
| CORE | Citizens of Oakland Respond to Emergencies | FEMA | |
| CORE | capabilities, objectives, resources and evaluation | MGMT | |
| CORS | Continuously Operating Reference Station | FEMA | |
| COS | Cash on Shipment | FEMA | |
| COS | Chief of Staff | DHS | |
| COSIN | Control Staff Instruction | FEMA | |
| COSMIC | Computer Software Management and Information Center (NASA) | FEMA | |
| COSO | Chief of Staff Office/Operations (former DHS Subcomponent) | DHS | |
| COSP (see PLCY) | Chief of Staff Office/Policy (former DHS Subcomponent) | DHS | |
| COST | Cost Unit Leader | FEMA | |
| COTHEN | Cellular Over the Horizon Enforcement Network | CBP | FEMA | |
| COTP | Captain of the Port | CBP | USCG | |
| COTR | Contracting Officer's Technical Representative | MGMT | |
| COTS | Commercial Off-the-shelf | DHS | |
| COUSCS | Commercial Operations of the United States Customs Svc, Advisory Committee on | CBP | |
| COW | Cellular on Wheels | FEMA | |
| CP | Command Post | FEMA | |
| CP | Control Point | FEMA | |
| CP | Coordination and Planning | FEMA | |
| CPA | Coalition Provisional Authority | PLCY | |
| CPAS | Cellular Priority Access System | FEMA | |
| CPAV | Community Program Assistance Visit | FEMA | |
| CPC | Country of Particular Concern | PLCY | |
| CPC | Climate Prediction Center | FEMA | |
| CPC | Commission on Professional Credentialing | FEMA | |
| CPD | Community Planning and Development | FEMA | |
| CPD | Community Preparedness Division | FEMA | |
| CPE | Contingency Planning Exchange | FEMA | |
| CPG | Civil Preparedness Guide | FEMA | |
| CPG | Comprehensive Preparedness Guides | FEMA | |
| CPHC | Central Pacific Hurricane Center | FEMA | |
| CPI | Consumer Price Index | FEMA | |
| CPI | critical program information | MGMT | |
| CPI | continuous process improvement | DHS | |
| CPIC | Capital Planning and Investment Control | I&A | MGMT | |
| cpm | characters per minute | FEMA | |
| cpm | counts per minute | FEMA | |
| CPMCC | Coalition Partner Mobile Command Center | FEMA | |
| CPO | Chief Procurement Officer | MGMT | |
| CPO | Central Processing Office | FEMA | |
| CPOT | Consolidated Priority Organization Target | ICE | |
| CPPA | Certified Professional Property Administrator | FEMA | |
| CPPM | Certified Professional Property Manager | FEMA | |
| CPPS | Certified Professional Property Specialist | FEMA | |
| CPR | Cardiopulmonary Resuscitation | FEMA | |
| CPRM | Checkpoint Resource Management | TSA | |
| CPS | Certified Public Secretary | FEMA | |
| CPSC | Consumer Product Safety Commission | FEMA | ICE | |
| CPSD | Contingency Planning and Support Division | FEMA | |
| CPSP | Comprehensive Passenger Screening Profile | TSA | |
| CPTED | Crime Prevention Through Environmental Design | FEMA | |
| CPU | Central Processing Unit | FEMA | |
| CPX | Command Post Exercise | FEMA | CISA | |
| CQA | Commandant's Quality Award | USCG | |
| CR | Civil Rights | FEMA | |
| CR | Claims Representative | FEMA | |
| CR | Community Relations | FEMA | |
| CR | Congressional Relations | FEMA | |
| CR | County Road | FEMA | |
| CR | continuing resolution | S&T | |
| CRA | certified release authority | I&A | |
| CRADA | Cooperative Research and Development Agreement | FLETC | |
| CRAF | Civil Reserve Air Fleet | FEMA | CISA | |
| CRAMP | Coral Reef Assessment and Monitoring Program | FEMA | |
| CRC | Contamination Reduction Corridor | FEMA | |
| CRC | Crisis Response Cell | FEMA | |
| CRC | Curriculum Review Conference | FLETC | |
| YES | Civil Rights and Civil Liberties, Office of | DHS | |
| CRCPD | Conference of Radiation Control Program Directors | FEMA | |
| CRDC | Cybersecurity Research & Development Center | S&T | |
| CRDF | United States Civilian Research & Development Foundation | S&T | |
| CRDS | Consolidated Remote Delivery Site | MGMT | |
| CREATE | Center for Risk and Economic Analysis of Terrorism Events | S&T | PLCY | |
| CREM | Classified Removable Electronic Media | FEMA | |
| CREP | Crew Representative | FEMA | |
| CREST | Contingency Real Estate Support Team | FEMA | |
| CREW | Cascadia Region Earthquake Workgroup | FEMA | |
| CRI | Cities Readiness Initiative | FEMA | CISA | |
| CRL | Certificate Revocation Lists | FEMA | |
| CRM | Crisis (or Communications) Resource Manager | FEMA | |
| CRM | Common Risk Model | CISA | |
| CRO | Community Reuse Organization | FEMA | |
| CRO | Congressional Relations Officer | FEMA | |
| CROP | Common Relevant Operational Picture | FEMA | |
| CROSS | Counterterrorism Reporting on Suspicious Surveillance | I&A | PLCY | PRIV | |
| CRP | Conservation Reserve Program | FEMA | |
| CRP | Critical Review Phase | FEMA | |
| CRR | Case Resolution Records | FEMA | |
| CRRDB | Comprehensive Reference Resource Database | FEMA | |
| CRREL | (United States Army) Cold Region Research and Engineering Laboratory | FEMA | |
| CRS | Catholic Relief Services | FEMA | |
| CRS | Community Rating System | FEMA | |
| CRS | Community Relations Service | FEMA | |
| CRS | Congressional Research Service | FEMA | |
| CRT | Cathode Ray Tube | FEMA | |
| CRTF | Commander, Response Task Force (DOD) | FEMA | |
| CRTF | Crisis Response Task Force | FEMA | (Video) A Dictionary of Information Security Terms, Abbreviations and Acronyms ~ Samuel |
| CRUD | Create, Retrieve, Update, Delete | FEMA | |
| CRWB | Crew Boss | FEMA | |
| CRWG | (Hurricane Katrina) Comprehensive Review Working Group | FEMA | |
| CRWG | Crisis Response Working Group | FEMA | |
| CRWRC | Christian Reformed World Relief Committee | FEMA | |
| CRYSYS | Cryospheric System | FEMA | |
| CRZ | Contamination Reduction Zone | FEMA | |
| CS | Chief of Staff | FEMA | |
| CS | Chief Scientist [NOAA] | FEMA | |
| CS | critical sensitive [position] | MGMT | |
| CS&C | Cyber Security and Communications, Office of (NPPD/CS&C) | DHS | |
| CS&T | Cyber Security and Telecommunication (see CS&C) | FEMA | |
| CS1M | Contracting Specialist, 1M | FEMA | |
| CS25 | Contracting Specialist, 25K | FEMA | |
| CSA | Chief of Staff, Army | FEMA | |
| CSA | Cognizant Security Authority | FEMA | |
| CSA | Community Services Administration | FEMA | |
| CSAC | Chemical Security Analysis Center | S&T | |
| CSAF | Chief of Staff, Air Force | FEMA | |
| CSB | United States Chemical Safety & Hazard Investigation Board | FEMA | |
| CSBG | Community Services Block Grant | FEMA | |
| CSD | Container Security Device | CBP | S&T | |
| CSDGM | Content Standard for Digital Geospatial Metadata | FEMA | |
| CSDP | Chemical Stockpile Disposal Program | FEMA | |
| CSE | Communications Security Establishment | FEMA | |
| CSEM | Center for the Study of Emergency Management | FEMA | |
| CSEPP | Chemical Stockpile Emergency Preparedness Program | FEMA | |
| CSG | Coordinating Sub-Group | FEMA | |
| CSG | Council of State Governments | FEMA | |
| CSG | Counterterrorism Security Group | FEMA | |
| CSH | Combat Support Hospital | FEMA | |
| CSHEMA | Campus Safety, Health & Environmental Management Associations | FEMA | |
| CSHIB | Chemical Safety and Hazards Investigation Board | FEMA | |
| CSHO | Compliance Safety and Health Officer- OSHA | FEMA | |
| CSI | Customer Satisfaction Index | TSA | |
| CSI | Container Security Initiative | CBP | TSA | |
| CSID | Call Subscriber ID | FEMA | |
| CSID | Centralized Scheduling and Information Desk | FEMA | |
| CSIL | Commercial Satellite Imagery Library | FEMA | |
| CSIRC | Computer Security Incident Response Center | FEMA | |
| CSIRT | Computer Security Incident Response Team | FEMA | |
| CSIS | Center for Strategic International Studies | DHS | |
| CSIS | Credited Structures Inventory System | FEMA | |
| CSIS | Canadian Security Intelligence Service | DHS | |
| CSM | Chemical Surety Material | FEMA | |
| CSMIP | California Strong-Motion Instrumentation Program | FEMA | |
| CSO | Chief Security Officer | MGMT | |
| CSO | Component Security Officer | MGMT | |
| CSP | Certified Safety Professional | FEMA | |
| CSPI | Critical Systems Protective Initiative | FEMA | USSS | |
| CSPO | Cargo Systems Program Office | CBP | |
| CSREES | Cooperative State Research Education and Extension Service | FEMA | |
| CSRS | Civil Service Retirement System | MGMT | |
| CST | Central Standard Time | FEMA | |
| CST | Civil Support Team (National Guard--for WMD) | FEMA | |
| CSTARC | Cyber Security Tracking, Analysis and Response Center | CISA | |
| CSTE | Council of State and Territorial Epidemiologists | FEMA | |
| CSU | Crime Scene Unit | USSS | |
| CSU | Clearing-Staging Unit | FEMA | |
| CSU | Customer Satisfaction Unit | CRCL | |
| CT | Counterterrorism | I&A | |
| CT/NP-ESG | Counterterrorism and National Preparedness Exercise Sub-Group | FEMA | |
| CTA | Combined Travel Authorization | FEMA | |
| CTAB | Counterterrorism Advisory Board | I&A | |
| CTAC | Chemical Transportation Advisory Committee | USCG | |
| C-TAP | Counter-Terrorism Airport Primacy | FEMA | |
| CTB | see CMTB | S&T | |
| CTBT | Comprehensive Nuclear Test Ban Treaty | FEMA | |
| CTC | Counterterrorism Center | I&A | |
| CTC | Conference and Training Center | FEMA | |
| CTCC | Counterproliferation Technology Coordinating Committee | FEMA | |
| CTD | Concept and Technology Development | FEMA | |
| CTD | Cumulative Trauma Disorder | FEMA | |
| CTD | Counterterrorist Division | DHS | |
| CTF | Combined Task Force | FEMA | |
| CTGP | Competitive Training Grant Program | FEMA | |
| CTI | Computer Telephony Integration | FEMA | |
| CTIA | Cellular Telecommunications & Internet Association | FEMA | |
| CTISS | Common Terrorism Information Sharing Standards | FEMA | |
| CTJTF | Counter-Terrorism Joint Task Force | FEMA | |
| CTOC | Containerized Tactical Operations Center | FEMA | |
| CTOEM | Connecticut Office of Emergency Management | FEMA | |
| CTOTF | Counter-Terrorism Operations Training Facility | FLETC | |
| CTP | Cooperating Technical Partners (Initiative) | FEMA | |
| C-TPAT | Customs-Trade Partnership Against Terrorism | CBP | |
| CTR | Crew Time Report | FEMA | |
| CTS | Carpal Tunnel Syndrome | FEMA | |
| CTS | Cooperating Technical State | FEMA | |
| CTSP | Computer Technical Specialist | FEMA | |
| CTTA | Certified TEMPEST Technical Authority | MGMT | |
| CTTP | Consolidated Trusted Traveler Program | CBP | TSA | PLCY | PRIV | |
| CTU | Chemistry/Toxicology Unit, | FEMA | |
| CTUIR | Confederated Tribes of the Umatilla Indian Reservation | FEMA | |
| cu | cubic | FEMA | |
| CUI | Controlled Unclassified Information | DHS | |
| CUI | controlled but unclassified information | MGMT | |
| CUL | Cost Unit Leader | FEMA | |
| CULS | Cultural Specialist | FEMA | |
| CUREE | Consortium of Universities for Research in Earthquake Engineering | FEMA | |
| CUSEC | Central United States Earthquake Consortium | FEMA | |
| CUSP | Central United States Partnership | FEMA | |
| CV | Combined Verification | FEMA | |
| CV | Curriculum Vitae | FEMA | |
| CVE | Common Vulnerabilities and Exposures | FEMA | |
| CVE | countering violent extremism | I&A | |
| CVI | Commercial Vehicle Inspection | FEMA | |
| CVO | Cascades Volcano Observatory | FEMA | |
| CVP | Citizenship Verification Procedures | FEMA | |
| CVS | Clearance Verification System | FEMA | |
| CVS | Combined Verification Section | FEMA | |
| CVVFA | Cumberland Valley Volunteer Firemen’s Association | FEMA | |
| CW | Chemical Warfare/Weapons | FEMA | |
| CW | Continuous Wave | FEMA | |
| CWA | Chemical Warfare Agent | S&T | |
| CWA | Clean Water Act | FEMA | |
| CWC | Chemical Weapons Convention | FEMA | |
| CWG | Concept Working Group | FEMA | |
| CWG | Continuity of Operations Working Group | FEMA | |
| CWIED | command wire improvised explosive device | S&T | |
| CWIN | Critical Infrastructure Warning Information Network | I&A | |
| CWIN | Cyberspace Warning Intelligence Network | FEMA | |
| CWMD | Countering Weapons of Mass Destruction | DHS | |
| CWN | Call When Needed | FEMA | |
| CWP | Center for Watershed Protection | FEMA | |
| CWS | Check Writing System | FEMA | |
| CWS | Church World Service | FEMA | |
| CWS | Compressed Work Schedule | FEMA | |
| CWSN | Cisco Works for Switched Networks | FEMA | |
| CWU | Church Women United | FEMA | |
| CY | Calendar Year | DHS | |
| cy | cubic yard | FEMA | |
| CZM | Coastal Zone Management | FEMA | |
| CZMA | Coastal Zone Management Act | FEMA | |
| D/A | Departments and Agencies | FEMA | |
| D2PC | An Army computer dispersion modeling capability | FEMA | |
| D2Puff | An Army computer dispersion modeling capability that can factor in terrain and wind changes | FEMA | |
| DA | Damage Assessment | FEMA | |
| DA | Declaration of Applicant | FEMA | |
| DA | Department of the Army | FEMA | |
| DA | Disaster Assistance (FEMA/DA) | DHS | |
| DA | District Attorney | FEMA | |
| DA PAM | Department of the Army Pamphlet | FEMA | |
| DAA | Designated Accrediting Authority | FEMA | |
| DAAC | Distributed Active Archive Center | FEMA | |
| DAAMS | Depot Area Air Monitoring System | FEMA | |
| DAAT | DHS Acronyms, Abbreviations, & Terms | DHS | |
| DAC | Defense Ammunition Center | FEMA | |
| DAC | Direct Air Carrier | FEMA | |
| DAC | Disaster Assistance Center (or Direct Air Carrier) | FEMA | |
| DACA | Deferred Action for Childhood Arrivals | USCIS | |
| DACS | Deportable Alien Control System | ICE | PLCY | PRIV | |
| DAD | Deputy Assistant Director | FEMA | |
| DAE | Disaster Assistance Employee [aka: "SAE"] | FEMA | MGMT | OPA | |
| DAEO | Designated Agency Ethics Official | OGC | |
| DAGC | Deputy Associate General Counsel | OGC | |
| DAIP | Disaster Assistance Improvement Program | FEMA | |
| DALIS | Disaster Assistance Logistics Information System | FEMA | |
| DALO | Disaster Area Liaison Officer | FEMA | |
| DAM | Digital Asset Management | I&A | MGMT | |
| DAMAGES | Disaster Accountability Management System | FEMA | |
| DAN | Document Accountability Number | FEMA | |
| DAO | Defense Attache Office | I&A | |
| DAP | Disaster Assistance Program | FEMA | |
| DAR | Designated Agency Representative | FEMA | |
| DARAC | Direct Assistance Replacement Assistance Consideration | FEMA | |
| DARCOM | Development And Readiness Command | FEMA | |
| DARIS | Disaster Automated Reporting and Information System | FEMA | |
| DARO | Defense Airborne Reconnaissance Office | FEMA | |
| DARP | data access request process | MGMT | |
| DARPA | Defense Advance Research Projects Agency | CISA | S&T | |
| DART | Disaster Assistance and Response Team | USCG | |
| DART | Daily Advisories/Risk and Threat | FEMA | |
| DART | Damage Assessment Reconnaissance Team | FEMA | |
| DART | DHS Accessibility Requirements Tool | FEMA | |
| DART | Disaster Assessment and Recovery Team | FEMA | |
| DART | Disaster Assessment and Response Team | FEMA | |
| DASA(ECW) | Deputy Assistant Secretary of the Army for the Elimination of Chemical Weapons | FEMA | |
| DASC | Disaster Assistance Support Center | FEMA | |
| DASH | Deputy Assistant Secretary for Health | FEMA | |
| DASHO | Designated Agency Safety and Health Official | FEMA | |
| DASP | Disaster Assistance Support Program | FEMA | |
| DAST | Disaster Assessment Survey Team | FEMA | |
| DAT | Digital Audio Tape | FEMA | |
| DAWG | Disaster Attache Working Group | PLCY | |
| DAWIA | Defense Acquisition Workforce Improvement Act | FEMA | |
| DB | Database | FEMA | |
| dB | decibel | FEMA | |
| dB(A/B/C) | Indicating The Method Used to Weight Sound Frequencies When Measuring Sound Pressure Levels | FEMA | |
| DBA | Database Administrator | FEMA | |
| DBA | Design Basis Accident | FEMA | |
| DBMS | Database Management System | I&A | MGMT | |
| DBT | design-basis threat | MGMT | |
| DC | Dangerous Contact | FEMA | |
| DC | Direct Current | FEMA | |
| DC | Dislocated Civilians | FEMA | |
| DC | District of Columbia | FEMA | |
| DC | Dry Chemical | FEMA | |
| DC | direct current | S&T | |
| DCA | Defense Communications Agency | FEMA | CISA | |
| DCA | Disaster Communication Agreement | FEMA | OPA | |
| DCAA | Defense Contract Audit Agency | S&T | |
| DCAC | Demilitarization Chemical Agent Concentrator | FEMA | |
| DCAS | Document Control and Accountability System | FEMA | |
| DCBP | Double Check Backflow Preventer | FEMA | |
| DCC | Document Control Center | FEMA | |
| DCC | Donation Coordination Center | FEMA | |
| DCCC | Defense Collection Coordination Center | FEMA | |
| DCD | Deseret Chemical Depot | FEMA | |
| DCE | Defense Coordinating Element | FEMA | |
| DCE | Disaster Communications Equipment | FEMA | OPA | |
| DCE/MED TF | Disaster Coordinating Element/ Medical Task Force | FEMA | |
| DCEMA | District of Columbia Emergency Management Agency | FEMA | |
| DCFO | Deputy Chief Financial Officer | FEMA | |
| DCFSA | Dependent Care Flexible Spending Account | FEMA | |
| DCG | Disaster Control Group | FEMA | |
| DCHD | DuPage County Health Department | FEMA | |
| DCI | Director of Central Intelligence | DHS | I&A | |
| DCID | Director of Central Intelligence Directive | FEMA | |
| DCIS | Defense Criminal Investigative Service | DHS | |
| DCIX | DHS Counterintelligence Executive | I&A | |
| DCLN | Declaration | FEMA | |
| DCLO | Deputy Congressional Liaison Officer | FEMA | |
| DCM | Deputy Chief of Mission | FEMA | |
| DCMI | Dublin Core Metadata Initiative | MGMT | |
| DCN | Disaster Contractors Network | FEMA | |
| DCN | Document Control Number | FEMA | |
| DCO | Defense Coordinating Officer | FEMA | |
| DCO | Disaster Coordinating Office | FEMA | |
| DCP | Development Concept Plan | FEMA | |
| DCPA | Defense Civil Preparedness Agency | FEMA | |
| DCPDS | Defense Civilian Personnel Data System | FEMA | |
| DCPS | Digital Cartographic Production System | FEMA | |
| DCS | Digital Control System | S&T | |
| DCS | Data Collection System | FEMA | |
| DCS | Defense Communications System | FEMA | |
| DCS | Defense Courier Service | FEMA | |
| DCS | Deputy Chief of Staff | FEMA | |
| DCT | Data Collection Tool | FEMA | |
| DCT | Donations Coordination Team | FEMA | |
| DCV | Detector Check Valve | FEMA | |
| DCWDB | Direction, Control and Warning Database | FEMA | |
| DCX | Direction and Control Exercise | FEMA | |
| DD | Damaged Dwelling | FEMA | |
| DD | Defensive Driving | FEMA | |
| DD | Direct Dial | FEMA | |
| DD | Dynamic Data | FEMA | |
| DDD | Direct Distance Dialing | FEMA | |
| DDE | Dynamic Data Exchange | FEMA | |
| DDL | Data Definition Language | FEMA | |
| DDO | Deputy Director of Operations | FEMA | |
| DDOS | Distributed Denial of Service | USSS | |
| DDP | Data-Derived Product | FEMA | |
| DDRM | Deputy Disaster Recovery Manager | FEMA | |
| DEA | Data Exchange Agreement | FEMA | |
| DEA | Drug Enforcement Administration | DHS | |
| DEAC | Deemed Export Advisory Council | PLCY | |
| DEAS | Digital Emergency Alert System | FEMA | |
| DEASTP | Digital Evidence Acquisition Specialist Training Program | FLETC | |
| DEC | DCI Environmental Center | FEMA | |
| DEC | Director’s Executive Council | FEMA | |
| DEC | Disaster Emergency Communications | FEMA | |
| DEC | Disasters Emergency Committee | FEMA | |
| DECD | Department of Economic and Community Development | FEMA | |
| DECK | Deck Coordinator | FEMA | |
| DECON | Decontamination | FEMA | |
| DED | Department of Education | FEMA | |
| DEE | Department Environmental Executive (DHS) | FEMA | |
| DEEDS | Data Elements for Emergency Department Systems (CDC) | FEMA | |
| DEERS | Defense Eligibility Enrollment Reporting System | FEMA | |
| DEFCON | Defense Condition | FEMA | |
| deg | degree | FEMA | |
| DEI | Dose Equivalent Iodine | FEMA | |
| DELO | Deputy Environmental Liaison Officer | FEMA | |
| DEM | Department of Environmental Management | FEMA | |
| DEM | Digital Elevation Model | FEMA | |
| DEM | Division of Emergency Management | FEMA | |
| DEMA | Department of Energy and Military Affairs | FEMA | |
| DEMS | Domestic Emergency Management System | FEMA | |
| DEN | Domestic Events Network | FEMA | |
| DEO | Detention Enforcement Officer | ICE | |
| DEP | Department of Environmental Protection | FEMA | |
| DEP | Domestic Emergency Preparedness | FEMA | |
| DEPER | Deployed Personnel Report | FEMA | |
| DEPS | Domestic Emergency Planning System | FEMA | |
| DEPSEC | Deputy Secretary | FEMA | |
| DEPSECDEF | Deputy Secretary of Defense | FEMA | |
| DEQ | Department of Environmental Quality | FEMA | |
| DERC | Damage Estimates, Ranges and Casualties | FEMA | |
| DERF | Defense Emergency Response Fund | FEMA | |
| DERIS | Domestic Emergency Response Information Services | FEMA | |
| DES | Data Encryption Standard | FEMA | |
| DES | Disaster Emergency Services | FEMA | |
| DES | Division of Emergency Services | FEMA | |
| DESCOM | Depot System Command | FEMA | |
| DEST | Domestic Emergency Support Team | FEMA | |
| DETER | Defense Technology Experimental Research | S&T | |
| DEW | Distant Early Warning | FEMA | |
| DFA | Direct Federal Assistance | FEMA | |
| DFAA | Delegation of Financial Assistance Authority | MGMT | |
| DFAIT | Department of Foreign Affairs and International Trade | PLCY | |
| DFAS | Defense Financial Accounting Service | ICE | |
| DFCO | Deputy Federal Coordinating Officer | FEMA | |
| DFIRM | Digital Flood Insurance Rate Map | FEMA | |
| DFIRM-DLG | Digital Flood Insurance Rate Map - Digital Line Graph | FEMA | |
| DFO | Designated Federal Official | FEMA | CISA | |
| DFO | Disaster Field Office | FEMA | |
| DFOM | Disaster Field Operations Management | FEMA | |
| DFOMC | Disaster Field Operations Management Course | FEMA | |
| DFRN | Disaster Federal Register Notice | FEMA | |
| DFSG | Disaster Financial Services Group | FEMA | |
| DFSR | Disaster Financial Status Report | FEMA | |
| DFTO | Disaster Field Training Office | FEMA | |
| DFTO | Disaster Field Training Organization | FEMA | |
| DG/CS | Dangerous Goods/Cargo Security | CBP | TSA | |
| DGCO | Deputy Grant Coordinating Officer | FEMA | |
| DGN | Design (File) | FEMA | |
| DGPS | Differential Global Positioning System | FEMA | |
| DGSA | DOD Goal Security Architecture | FEMA | |
| DGZ | Desired Ground Zero | FEMA | |
| DH | Disaster Housing | FEMA | |
| DHA | Disaster Housing Assistance | FEMA | |
| DHAP | Disaster Housing Assistance Program | FEMA | |
| DHC | Disaster Housing Checkwriter | FEMA | |
| DHCD | Department of Housing and Community Development | FEMA | |
| DHelp | Disaster Help Web Site | FEMA | |
| DHF | Dengue Hemorrhagic Fever | FEMA | |
| DHHS | Department of Health and Human Services | FEMA | |
| DHO | Disaster Housing Officer (replaced by IA Program/HA Manager) | FEMA | |
| DHP | Disaster Housing Program (replaced by IHP/HA) | FEMA | |
| DHS | Disaster Health Service | FEMA | |
| DHS | U.S. Department of Homeland Security | DHS | |
| DHS CAT | DHS Crisis Action Team | I&A | |
| DHS-IE | Department of Homeland Security Intelligence Enterprise | I&A | |
| DHS-ISE | DHS Information Sharing Environment | MGMT | |
| DHUD | Department of Housing and Urban Development (also HUD) | FEMA | |
| DIA | Defense Intelligence Agency | CISA | I&A | |
| DIAC | Defense Intelligence & Analysis Center | I&A | |
| DIAO | Deputy Individual Assistance Officer | FEMA | |
| DIB | Defense Industrial Base | CISA | |
| DIC | Deputy Incident Commander | FEMA | |
| DICE | DEA Internet Connectivity Endeavor | I&A | |
| DID | Direct Inward Dial | FEMA | |
| DIDA | Detection, Identification, and Assessment | FEMA | |
| DIDS | Decision Information Distribution System | FEMA | |
| DIFAX | Digital Facsimile | FEMA | |
| DIHS | Division of Immigration Health Services | USCIS | |
| DII | Defense Information Infrastructure | FEMA | |
| DIL | Derived Intervention Level | FEMA | |
| DIMC | Digital Identity Management Center | ICE | |
| DIMHRS | Defense Integrated Military Human Resources System | FEMA | |
| DIMO | Defense Institute of Medical Operations | FEMA | |
| DIMOS | Drug Intelligence Method of Operation System | ICE | |
| DIR | Director | FEMA | |
| DIR | Domestic Imagery Requirement | FEMA | |
| DIRC | Disaster Information Resource Center | FEMA | |
| DIRNSA | Director, National Security Agency | FEMA | |
| DIS | Defense Investigative Service | FEMA | |
| DIS | Distributed Interactive Simulation | FEMA | |
| DIS | digital imaging system | MGMT | |
| DISA | Defense Information Systems Agency | CISA | |
| DISC | Disaster Information System Clearinghouse | FEMA | |
| DISCO | Defense Industrial Security Clearance Office | FEMA | |
| DISCO | Defense Industrial Security Clearance Officer | FEMA | |
| DISN | Defense Information System Network | FEMA | |
| Disposition PTA | disposition privacy threshold analysis | I&A | |
| DISUM | Daily Intelligence Summary | FEMA | |
| DISUM | Disaster Summary | FEMA | |
| DIVS | Division/Group Supervisor | FEMA | |
| DLA | Defense Logistics Agency | FEMA | CISA | |
| DLG | Digital Line Graph | FEMA | |
| DLG-3 | Digital Line Graph Level 3 | FEMA | |
| DLL | Dynamic-Link Library | FEMA | |
| DLS | Disaster Legal Services | FEMA | |
| DLSGP | Driver's License Security Grant Program | FEMA | |
| DLT | Department Leadership Team | FEMA | |
| DM | Dimension | FEMA | |
| DM | Disaster Management | FEMA | CISA | |
| DMA | Defense Mapping Agency | FEMA | |
| DMA | Designated Market Area | FEMA | |
| DMA | Disaster Mitigation Act | FEMA | |
| DMA | Disaster Mitigation Act of 2000 (also called DMA 2000 or DMA2K) | FEMA | |
| DMAC | Disaster Management Advisory Committee | FEMA | |
| DMAG | Deputy’s Management Action Group | MGMT | |
| DMAT | Disaster Medical Assistance Team | FEMA | OPS | |
| DMDC | Defense Manpower Data Center | FEMA | |
| DMH | Department of Mental Health | FEMA | |
| DMH | Disaster Mental Health | FEMA | |
| DMHT | Disaster Mental Health Team | FEMA | |
| DMI | Disaster Management Interoperability | FEMA | |
| DMIATF | Data Management Improvement Act Task Force, INS | DHS | |
| DMIS | Disaster Management Interoperability Services | S&T | |
| DMI-Services (or DMIS) | Disaster Management Interoperability Services | FEMA | |
| DMOB | Demobilization Unit Leader | FEMA | |
| DMORT | Disaster Mortuary Operational Response Team | FEMA | OPS | |
| DMRIS | Defense Medical Regulating Information System | FEMA | |
| DMRS | Data Management and Retrieval System | FEMA | |
| DMS | Dispatch Messaging System | FEMA | |
| DMS | Document Management System | FEMA | |
| DMSS | Defense Medical Surveillance System | FEMA | |
| DMV | Department of Motor Vehicles | FEMA | |
| DNA | Defense Nuclear Agency | FEMA | |
| DNA | Deoxyribonucleic acid | FEMA | S&T | |
| DNAT | Defense Nuclear Advisory Team | FEMA | |
| DND | Department of National Defense | FEMA | |
| DNDO | Domestic Nuclear Detection Office (see CWMD) | DHS | |
| DNF | Did Not Finish | FEMA | |
| DNFSB | Defense Nuclear Facilities Safety Board | FEMA | |
| DNI | Director of National Intelligence | DHS | |
| DNR | Department of Natural Resources | FEMA | |
| DNS | Department of Nuclear Safety | FEMA | |
| DNS | Domain Name Server | FEMA | |
| DNSSEC | Domain Name System Security Extensions | FEMA | |
| DO | Designated Official (OEP) | FEMA | |
| DO | Digital Orthophoto | FEMA | |
| DO | Director of Operations | FEMA | |
| DO | Disaster Operations (FEMA/DO) | DHS | |
| DOA | Dead On Arrival | FEMA | |
| DOA | Department of Agriculture | FEMA | |
| DOB | Date of Birth | FEMA | |
| DOB | Duplication of Benefits | FEMA | |
| DOC | Department Operations Center | FEMA | |
| DOC | Discrete Organic Chemicals | FEMA | |
| DOC | Department of Corrections | ICE | |
| DOC | Department of Conservation | FEMA | |
| DOC | United States Department of Commerce | DHS | |
| DOCL | Documentation Unit Leader | FEMA | |
| DOD | United States Department of Defense | DHS | |
| DODD | Department of Defense Directive | DHS | |
| DODESB | Department of Defense Explosive Safety Board | FEMA | |
| DODMS | DOD Discovery Metadata Standard | FEMA | |
| DODRDB | Department of Defense Resource Database | DHS | |
| DOE | United States Department of Energy | DHS | |
| DOEd | United States Department of Education (see ED) | FEMA | |
| DOG | Deployable Operations Group | FEMA | USCG | |
| DOH | Department of Health | FEMA | |
| DOI | Innovation/HSARPA Division (S&T/DOI) | DHS | |
| DOI | United States Department of the Interior | DHS | |
| DOIM | Director of Information Management | FEMA | |
| DOJ | United States Department of Justice | DHS | |
| DOL | United States Department of Labor | DHS | |
| DOLP | Disaster Operations Leadership Program | FEMA | |
| DOM | Disaster Operations Manual | FEMA | |
| DOMO | Domestic Operations (USCIS/DOMO) | DHS | |
| DOMS | Director of Military Support | FEMA | |
| DON | Donation | FEMA | |
| DONAT | Donation | FEMA | |
| DOQ | Digital Orthophoto Quadrangle | FEMA | |
| DOR | Research Division (S&T/DOR) | DHS | |
| DOS | Disk Operating System | FEMA | |
| DOS | United States Department of State | DHS | |
| DOT | Transition Division (S&T/DOT) | DHS | |
| DOT | United States Department of Transportation | DHS | |
| DOZB | Dozer Boss | FEMA | |
| DP | Disaster Preparedness | FEMA | |
| DP | Double Pedestal | FEMA | |
| DP# | (Drop points are numbered and marked locations on a fire where people meet, equipment is exchanged, and resources may be stationed.) | FEMA | |
| DPA | Deepwater Ports Act | FEMA | |
| DPA | Defense Production Act | FEMA | |
| DPA | Delegation of Procurement Authority | I&A | MGMT | |
| DPAO | Deputy Public Affairs Officer | FEMA | |
| DPAO | Deputy Public Assistance Officer | FEMA | |
| DPAS | Defense Priorities and Allocations System | FEMA | |
| DPC | Domestic Policy Council | FEMA | |
| DPETAP | Domestic Preparedness Equipment Technical Assistance Program (NDPC) | FEMA | |
| DPFO | Deputy Principal Federal Official | FEMA | |
| DPG | Defense Planning Guidance | FEMA | |
| DPIG | Disaster Preparedness Improvement Grant | FEMA | |
| DPM | Disintegrations Per Minute | FEMA | |
| DPMT | Disaster Pediatric Medical Team | FEMA | |
| DPMU | Disaster Portable Morgue Unit | FEMA | |
| DPOD | Disaster Personnel Operations Division | FEMA | |
| DPP | Disaster Processing Procedures | FEMA | CISA | |
| DPP | Domestic Preparedness Program | FEMA | CISA | |
| DPPC | Data Protection and Privacy Commissioners | DHS | |
| DPRE | Displaced Persons, Refugees and Evacuees | FEMA | |
| DPRO | Display Processor | FEMA | |
| DPS | Department of Public Safety | FEMA | |
| DPS | Dry Pendent Sprinkler | FEMA | |
| DPV | Dry Pipe Valve | FEMA | |
| DPW | Department of Public Works | FEMA | CISA | |
| DR | Disaster Declaration Number (alphabetic designation or precursor for) | FEMA | |
| DR | Disaster Recovery | FEMA | |
| DR | Disaster Response | FEMA | |
| DR | Door(s) | FEMA | |
| DRASH | Deployable Rapid-Assembly Shelter | FEMA | |
| DRAT | District Response Advisory Team | FEMA | |
| DRC | Disaster Recovery Center | FEMA | |
| DRD | Direct-Reading Dosimeter | FEMA | |
| DREC | Deputy Regional Emergency Coordinator | FEMA | |
| DRES | Disaster Response Evaluation System | FEMA | |
| DRF | Disaster Relief Fund | FEMA | |
| DRF | Disaster Response Force | FEMA | |
| DRG | Digital Raster Graphic | FEMA | |
| DRG | Disaster Response Group | FEMA | |
| DRG | District Response Group | FEMA | |
| DRG | Domestic Readiness Group | FEMA | |
| DRII | Disaster Recovery Institute International | FEMA | |
| DRL | Derived Response Levels | FEMA | |
| DRM | Data Reference Model | MGMT | |
| DRO | Detention and Removal Office (ICE/DRO) | DHS | |
| DRP | Division of Radiation Protection | FEMA | |
| DRS | Disaster Reconnaissance System | FEMA | |
| DRSF | Disaster Response Support Facilities | FEMA | |
| DRSS | Division of Radiation Safety and Safeguards | FEMA | |
| DRT | Disaster Response Team (NIMA) | FEMA | |
| DRTF | Disaster Relief Task Force | FEMA | |
| DRU | Direct Reporting Unit | FEMA | |
| DRU | Disaster Resistant Universities | FEMA | |
| DRU | Disaster Response Unit | FEMA | |
| DRWD | Disaster Reserve Workforce Division | FEMA | |
| DS | Damage Survey | FEMA | |
| DS | Deputy Secretary | FEMA | |
| DSA | Digital Standard Algorithm | I&A | |
| DSB | Defense Science Board | FEMA | |
| DSBCC | Detection Systems for Biological & Chemical Countermeasures | S&T | |
| DSC | Digital Selective Calling | FEMA | |
| DSCA | Defense Support of Civil Authorities | FEMA | |
| DSCO | Deputy State Coordinating Officer | FEMA | |
| DSCS | Defense Satellite Communications System | FEMA | |
| DSEA | Domestic Security Enhancement Act of 2003 | OGC | |
| DSEC | Deputy Secretary | DHS | |
| DSEL | Dynamic Synchronization Event Log | FEMA | |
| DSES | Directory Services and E-mail System | MGMT | |
| DSFO | Deputy Senior FEMA Official | FEMA | |
| DSL | Digital Subscriber Line | FEMA | |
| DSN | Defense Switched Network | FEMA | |
| DSO | Director of Site Operations | FEMA | |
| DSO | Disaster Safety Officer | FEMA | |
| DSP | Disaster Support Package | FEMA | |
| DSR | Damage Survey Report | FEMA | |
| DSS | Digital Signature Standard | FEMA | |
| DSS | Decision Support System | CISA | |
| DSS | Diplomatic Security Service | ICE | USSS | |
| DSSG | Defense Science Study Group | S&T | |
| DSWA | Defense Special Weapons Agency | CISA | |
| DT | Development Team | FEMA | |
| DT&E | Development Test and Evaluation | FEMA | |
| DT/CPS | Domestic Terrorism/Counterterrorism Planning Section (FBIHQ) | FEMA | |
| DTAPPS | Disposable Toxicological Agent Personal Protection System | FEMA | |
| DTD | Data Transfer Device | FEMA | |
| DTD | Document Type Definition | FEMA | |
| DTE | Disaster Temporary Employee(s) | FEMA | MGMT | OPA | |
| DTED | Digital Terrain Elevation Data | FEMA | |
| DTG | Date-Time Group | FEMA | |
| DTIC | Defense Technical Information Center | FEMA | |
| DTM | Digital Terrain Model | FEMA | |
| DTMF | dual tone multi frequency switch | S&T | |
| DTMS | Disaster Transportation Management System | FEMA | |
| DTO | Drug Trafficking Organization | ICE | |
| DTOC | Deployable Tactical Operations Center | FEMA | |
| DTOS | Deployable Tactical Operations System | FEMA | |
| DTRA | Defense Threat Reduction Agency | CISA | CWMD | I&A | |
| DTRG | Defense Technical Response Group | FEMA | |
| DTRIM | Domestic Threat Reduction and Incident Management | FEMA | |
| DTS | Diplomatic Telecommunications Service | FEMA | |
| DTSA | Defense Technical Security Agency | FEMA | |
| DU | Dobson Unit | FEMA | |
| DUA | Disaster Unemployment Assistance | FEMA | |
| DUH | Detached Unit Housing | FEMA | |
| DUL | Documentation Unit Leader | FEMA | |
| DULL SWORD | Nuclear safety deficiency | FEMA | |
| DUNS | Data Universal Numbering System | MGMT | |
| DURC | dual use research of concern [life sciences] | S&T | |
| DUS | Deputy Under Secretary | FEMA | |
| DUSIO | Deputy Under Secretary for Intelligence Operations | I&A | |
| DUSM | Deputy United States Marshal | FEMA | |
| DUST OFF | Medical Evacuation via Helicopter (slang) | FEMA | |
| DV | Distinguished Visitor | FEMA | |
| DVA | Department of Veterans Affairs | FEMA | |
| DVD | Digital Versatile Disk | FEMA | |
| DVM | Doctor of Veterinary Medicine | FEMA | |
| DW | Data Window | FEMA | |
| DWG | Drawing (file) | FEMA | |
| DWI | Disaster Welfare Information (or Inquiry) | FEMA | |
| DWI | Driving While Intoxicated | FEMA | |
| DWML | Digital Weather Markup Language | FEMA | |
| DWR | Department of Water Resources | FEMA | |
| DWT | Dead Weight | FEMA | |
| DWT | deadweight ton | PLCY | |
| DXF | Drawing Exchange Format | FEMA | |
| DZOP | Dozer Operator | FEMA | |
| E 911 | Enhanced 9-1-1 | FEMA | |
| E number | Equipment number | FEMA | |
| E.O. | Executive Order of the President | FEMA | |
| EA | Eastern Area | FEMA | |
| EA | Emergency Action | FEMA | |
| EA | Energy Assurance | FEMA | |
| EA | Environmental Assessment | FEMA | |
| EA | External Affairs | FEMA | |
| EA | Enterprise Architecture | MGMT | |
| EAB | Enterprise Architecture Board | FEMA | |
| EAB | Exclusion Area Boundary | FEMA | |
| EACC | Eastern Area Coordination Center | FEMA | |
| EACG | Eastern Area Coordinating Group | FEMA | |
| EACOE | Enterprise Architecture Center of Excellence | MGMT | |
| EACT | Emergency Action and Coordination Team | FEMA | |
| EAD | Executive Associate Director | FEMA | |
| EAD | Employment Authorization Document | USCIS | PLCY | PRIV | |
| EADRCC | Euro-Atlantic Disaster Response Coordination Center | FEMA | |
| EAG | Exercise Analysis Group | FEMA | |
| EAGLE | Enterprise Acquisition Gateway for Leading Edge Solutions | MGMT | |
| EAI | Enterprise Application Integration | I&A | MGMT | |
| EAL | Emergency Action Level | FEMA | |
| EAL | Entry Authority List | FEMA | |
| EAM | Emergency Action Message | FEMA | |
| EAO | Emergency Action Officer | FEMA | |
| EAO | Energy Assurance Office (see also EA) | FEMA | |
| EAP | Emergency Action Plan | FEMA | |
| EAP | Emergency Action Procedures | FEMA | |
| EAP | Emergency Assistance Personnel | FEMA | |
| EAP | Employee Assistance Program | FEMA | |
| EAP | Event Action Plan | FEMA | |
| e-APIS | electronic-Advanced Passenger Information System | FEMA | |
| EAPMO | Enterprise Architecture Program Management Office | MGMT | |
| EAR | Emergency Alert Radio | FEMA | |
| EAR | Exercise Analysis Report | FEMA | |
| EARN | Employer Assistance Referral Network | CRCL | |
| EARS | Emergency Animal Rescue Service | FEMA | |
| EART | Evening Advisory Risk Threat | FEMA | |
| EAS | Emergency Alert System | FEMA | |
| EAWA | Employ American Workers Act | FEMA | |
| EBR | Endogenous Biological Regulators | S&T | |
| EBS | Emergency Broadcast System (see EAS) | FEMA | |
| EBT | Electronic Benefits Transfer | FEMA | |
| EBW | Electronic Bridge Wire | FEMA | |
| EBW | Exploding Bridge Wire | FEMA | |
| EBW | exploding bridge wire initiator | S&T | |
| EC | Electronic Commerce | FEMA | |
| EC | Elevation Certificate | FEMA | |
| EC | Emergency Coordinator | FEMA | |
| EC | Environment of Care (medical) | FEMA | |
| EC | Extraordinary Circumstances | FEMA | |
| ECA | Earth-orbit Crossing Asteroid | FEMA | |
| ECA | Edgewood Chemical Activity | FEMA | |
| ECAB | Emergency Change Advisory Board | MGMT | |
| ECAPS | Enterprise Coordination & Approval Processing System | FEMA | |
| ECBC | Edgewood Chemical Biological Center | FEMA | |
| ECC | Emergency Communications Center | FEMA | OPA | |
| ECCS | Emergency Core Cooling System | FEMA | |
| ECCV | Emergency Command and Control Vehicle | FEMA | |
| ECD | Effective Cumulative Dose | FEMA | |
| ECD | Emergency Contacts Directory | FEMA | |
| ECD | Estimated Completion Date | FEMA | |
| ECFG | Emergency Coordination Functional Group | FEMA | |
| ECG | Emergency Coordination Group | FEMA | |
| ECG | Exercise Control Group | FEMA | |
| ECI | Export-Controlled Information | FEMA | |
| ECL | Emergency Classification Level | FEMA | |
| ECN | Executive Control Node | FEMA | |
| ECP | Emergency Conservation Program | FEMA | |
| ECP | Entry Control Point | FEMA | |
| ECPC | Emergency Communications Preparedness Center | FEMA | |
| ECS | Electronic Certification System | FEMA | |
| ECS | Emergency Communications Staff | FEMA | |
| ECS | Emergency Coordinating Staff | FEMA | |
| ECSAP | Electronic Crimes Special Agent Program | USSS | |
| ECT | Emergency Coordinating Team, | FEMA | |
| ECT | Exercise Control Team | FEMA | |
| ECT | See IQ (formerly Executive or Enterprise Correspondence Tracking System) | DHS | |
| ECTF | Electronic Crimes Task Force | USSS | |
| ECU | Environmental Control Unit | FEMA | |
| ECWAG | Emergency Community Water Assistance Grant | FEMA | |
| ED | Effective Dose | S&T | |
| ED | Emergency Department | FEMA | |
| ED | United States Department of Education | DHS | |
| ED&DG | Exercise Design and Development Group | FEMA | |
| EDA | Economic Development Administration | FEMA | |
| EDAC | Economic Defense Advisory Committee | FEMA | |
| EDAP | Excess Delivery Acquisition Program | FEMA | |
| EDC | Energy Disruption Committee | FEMA | |
| EDC | EROS Data Center | FEMA | |
| EDD | Explosive Detection Device | TSA | |
| EDE | Effective Dose Equivalent | FEMA | |
| EDEN | Education Disaster Extension Network | OPA | |
| EDI | Electronic Data Interchange | CBP | I&A | MGMT | PLCY | |
| EDIFACT | EDI for Administration, Commerce, and Transport | FEMA | |
| EDIS | Emergency Disaster Information System | FEMA | |
| EDITH | Exit Drills In The Home | FEMA | |
| EDL | Environmental Disposal Liability | FEMA | |
| EDMO | Enterprise Data Management Office (formerly MCOE) | MGMT | |
| EDPP | Electronic Design and Pre-Press | FEMA | |
| EDR | Economic Development Representative | FEMA | |
| EDR | External Data Request | FEMA | |
| EDRC | Expanded Dispatch Recorder | FEMA | |
| EDS | Explosive Detection System(s) | FEMA | TSA | |
| EDT | Eastern Daylight Time | DHS | |
| EDT | Explosive Device Team | FEMA | |
| EDXL | Emergency Data Exchange Language | FEMA | |
| EDXL-DE | EDXL Distribution Element | FEMA | |
| EDXL-RM | Emergency Data Exchange Language Resource Messaging | FEMA | |
| EEE | Eastern Equine Encephalitis | FEMA | |
| EEE | Essential Evaluation Elements | FEMA | |
| EEG | Exercise Evaluation Guide | FEMA | |
| EEGL | Emergency Exposure Guidance Level | FEMA | |
| EEI | External Environment Interface | I&A | MGMT | PLCY | |
| EEI | Essential Elements of Information | DHS | |
| EEM | Exercise Evaluation Methodology | FEMA | |
| EENET | Emergency Education Network | FEMA | |
| EEO | Equal Employment Office | FEMA | |
| EEO | Equal Employment Opportunity | FEMA | |
| EEOC | Equal Employment Opportunity Commission | FEMA | CRCL | |
| EER | Eligible Existing Resources | FEMA | |
| EERI | Earthquake Engineering Research Institute | FEMA | |
| EESL | Extreme Events Simulation Laboratory | S&T | |
| EET | Emergency Evacuation Team | FEMA | |
| EEVS | Employment Eligibility Verification System | CBP | ICE | USCIS | |
| EEX | Employee Express | FEMA | |
| EEZ | Exclusive Economic Zone | FEMA | |
| EFAP | Emergency Feed Assistance Program | FEMA | |
| EFL | environmental financial liabilities | S&T | |
| EFO | Emergency Field Office | FEMA | |
| EFOP | Executive Fire Officer Program | FEMA | |
| EFP | Emergency Feed Program | FEMA | |
| EFP | explosively formed projectile charge | S&T | |
| EFPOP | Executive Fire Prevention Officer Program | FEMA | |
| EFS | Emergency Food & Shelter | FEMA | |
| EFSNB | Emergency Food and Shelter National Board | FEMA | |
| EFSP | Emergency Food and Shelter Program | FEMA | |
| EFT | Electronic Funds Transfer | FEMA | |
| E-GIS | DHS-wide enterprise GIS system | FEMA | |
| EGM | Enhancing Grants Management | FEMA | |
| E-Gov | E-Government | FEMA | |
| EHM | Earthquake Hazard Mitigation | FEMA | |
| EHP | Environmental Planning & Historic Preservation | FEMA | |
| EHP | Environmental/Historic Preservation | FEMA | |
| EHR | Electronic Health Records | FEMA | |
| EHS | Extremely Hazardous Substance | FEMA | |
| EHU | Emergency Housing Unit | FEMA | |
| EI | Exercise Information | FEMA | |
| EIC | Earned Income Credit | FEMA | |
| EIC | Emergency Interoperability Consortium | FEMA | |
| EICC | Emergency Information and Coordination Center | FEMA | |
| EID | Enforcement Integrated Database | CBP | ICE | USCIS | I&A | PLCY | |
| EIDA | Executive Information and Display Area | FEMA | |
| EIDL | Economic Injury Disaster Loan | FEMA | |
| EIIP | Emergency Information Infrastructure Partnership | FEMA | |
| EIM | Emergency Information Management | FEMA | |
| EIMA | Emergency Information and Media Affairs | FEMA | |
| EIN | Employer Identification Number | FEMA | |
| EIO | Emergency Information Officer | FEMA | |
| EIPA | Emergency Information and Public Affairs | FEMA | |
| EIPT | Exercise Integrated Process Team | FEMA | |
| EIRS | Emergency Information Retrieval System | FEMA | |
| EIS | Epidemic Intelligence Service | I&A | |
| EIS | Emergency Information System | FEMA | OPA | |
| EIS | Environmental Impact Statement | FEMA | |
| EIS | Epidemiological Intelligence Service | FEMA | |
| EIT | Electronic Information Technology | CRCL | |
| EIT | electronic and information technology | MGMT | |
| EITS | Enhanced International Travel Security System | S&T | PLCY | PRIV | |
| EJ | Environmental Justice | FEMA | |
| EKU | Eastern Kentucky University | FEMA | |
| ELC | Engineering Logistics Center | USCG | |
| ELF | Earth Liberation Front | FEMA | |
| ELINT | Electronic Intelligence | CWMD | I&A | OPS | |
| ELO | Enabling Learning Objectives | FEMA | |
| ELO | Environmental Liaison Officer | FEMA | |
| ELR | Employee Labor Relations | FEMA | |
| ELT | Emergency Location Transmitter | USCG | |
| ELT | Evacuation Liaison Team | FEMA | |
| EM | Emergency Management | FEMA | |
| EM | Emergency Manager | FEMA | |
| EM | Environmental Management | FEMA | |
| EM | Exercise Manual | FEMA | |
| EMA | Emergency Management Agency | FEMA | |
| EMAC | Emergency Management Assistance Compact | FEMA | |
| E-mail | Electronic Mail | FEMA | |
| EMAP | Emergency Management Accreditation Program Standard | FEMA | S&T | |
| EMAS | Emergency Management Assessment System | FEMA | |
| EMD | Electronic Monitoring Device | ICE | |
| EMD | Emergency Management Director | FEMA | |
| EMD | Emergency Management Division | FEMA | |
| EMD | Emergency Medical Dispatcher | FEMA | |
| EMERCOM | Emergency Command | FEMA | |
| EMERGCON | Emergency Condition | FEMA | |
| eMerge2 | electronically Managing enterprise resources for government effectiveness and efficiency | DHS | |
| EMERS | Emergency Management Exercise Reporting System | FEMA | |
| EMI | Electromagnetic Interference | FEMA | |
| EMI | Emergency Management Institute | FEMA | |
| EMI | Emergency Management Institute, Board of Visitors for the | FEMA | |
| EMIO | Expanded Maritime Interdiction Operation | USCG | |
| EMIS | Emergency Management Information System | FEMA | |
| EML | Environmental Measurements Laboratory | S&T | CWMD | |
| EMMIE | Emergency Management Mission Integrated Environment (disasters) | FEMA | |
| EMNPP | Emergency Management and National Preparedness Program | FEMA | |
| EMOC | Emergency Management Operations Center | FEMA | |
| EMOC | Emergency Management Operations Course | FEMA | |
| EMP | Electromagnetic Pulse | FEMA | |
| EMP | Emergency Management Plan | FEMA | |
| EMPA | Emergency Management Planning and Assistance | FEMA | |
| EMPG | Emergency Management Performance Grant | FEMA | |
| EMPO | Emergency Medical Preparedness Office | FEMA | |
| EMPS | Emergency Management Program Specialist | FEMA | |
| EMPTY QUIVER | Theft, seizure, or loss of a nuclear weapon or component | FEMA | |
| EMR | Electromagnetic Radiation | FEMA | |
| EMR | Emergency Minimal Repair | FEMA | |
| EMR | Environmental Management Review | FEMA | |
| EMR-ISAC | Emergency Management & Response-Information Sharing & Analysis Center | FEMA | |
| EMRS | Emergency Management Response System | FEMA | |
| EMRT | Emergency Medical Response Team | FEMA | |
| EMS | Emergency Management Specialist | FEMA | |
| EMS | Emergency Medical Services | FEMA | |
| EMS | Emergency Medical System | FEMA | |
| EMS | Environmental Management System | FEMA | |
| EMS | Evacuation Management System | FEMA | |
| EMSHG | Emergency Management Strategic Healthcare Group | FEMA | |
| EMSSA | Emergency Medical Services System Act | FEMA | |
| EMSTEAC | Emergency Medical Services Training Education Advisory Council | MGMT | |
| EMT | Emergency Management Team | FEMA | |
| EMT | Emergency Management Training | FEMA | |
| EMT | Emergency Medical Technician | FEMA | |
| EMTALA | Emergency Medical Treatment and Active Labor Act | FEMA | |
| EMTASC | Emergency Management Training, Analysis & Simulation Center | FEMA | |
| EMT-B | Emergency Medical Technician - Basic | FEMA | |
| EMT-I | Emergency Medical Technician - Intermediate | FEMA | |
| EMT-P | Emergency Medical Technician - Paramedic | FEMA | |
| EMWIN | Emergency Managers Weather Information Network | FEMA | |
| END | Exotic Newcastle Disease | FEMA | |
| ENDEX | End of Exercise | FEMA | |
| ENGB | Engine Boss | FEMA | |
| ENOP | Engine Operator | FEMA | |
| ENR | Environmental and Natural Resources | FEMA | |
| ENS | Emergency Notification Service/System | FEMA | |
| ENSO | El Nino / Southern Oscillation | FEMA | |
| EO | Electro-Optical | FEMA | OGC | |
| EO | Emergency Office | FEMA | |
| EO | Environmental Officer | FEMA | |
| EO | Executive Order | FEMA | OGC | |
| EO | Exterior Orientation (Parameter) | FEMA | |
| EO/IR | Electro Optical/Infrared | CBP | ICE | |
| EOC | Emergency Operations Center | FEMA | |
| EOC | European Olympic Committee | FEMA | |
| EOD | Entered on Duty | FEMA | |
| EOD | Explosive Ordnance Disposal | FEMA | S&T | |
| EOD | entrance on duty | MGMT | |
| EOD | entry on duty | MGMT | |
| EOD determination | entry on duty determination | MGMT | |
| EOD determination | entrance on duty determination | MGMT | |
| EOE | Equal Opportunity Employer | FEMA | |
| EOEA | Executive Office of Environmental Affairs | FEMA | |
| EOF | Emergency Operations/Operating Facility | FEMA | |
| EOF | End of File | FEMA | |
| EOG | Exercise Observation Group | FEMA | |
| EOIR | Executive Office for Immigration Review | ICE | USCIS | |
| EOM | End of Month | FEMA | |
| EOO | Emergency Operations Organization | FEMA | |
| EOP | Emergency Operations/Operating Plan | FEMA | |
| EOP | Executive Office of the President | DHS | |
| EOP | Extent of Play | FEMA | |
| EOPT | Emergency Operations Planning Template | FEMA | |
| EOS | Earth-Observing System | FEMA | |
| EOS | Emergency Operations Software | FEMA | |
| EOS | Equation of State | FEMA | |
| EOT | Emergency Operations Team | FEMA | |
| EOV | Emergency Operations Vehicle | FEMA | |
| EOW | Envelope of Water | FEMA | |
| EP | Electric Power | FEMA | |
| EP | Emergency Programs | FEMA | |
| EP&HP | environmental planning and historic preservation | DHS | |
| EP&HP DSS | environmental planning and historic preservation decision support system | DHS | |
| EPA | United States Environmental Protection Agency | DHS | |
| EPAD | Emergency Provider Access Directory | FEMA | |
| EPAL | Enterprise Privacy Authorization Language | FEMA | |
| EPAP | Equipment Purchase Assistance Program | FEMA | |
| EPC | Emergency Preparedness Canada | FEMA | |
| EPCA | Energy Policy and Conservation Act | FEMA | |
| EPCRA | Emergency Planning and Community Right-to-Know Act | FEMA | |
| EPD | Electronic Personnel Dosimeter | FEMA | |
| EPEAT® | electronic product environmental assessment tool | MGMT | |
| EPG | Emergency Planning Guide | FEMA | |
| EPG | Exercise Preparation Guide | FEMA | |
| EPI | Emergency Public Information | FEMA | OPA | |
| EPIC | Emergency Preparedness Information Coordinator | FEMA | OPA | |
| EPIC | Electronic Privacy Information Center | TSA | S&T | PLCY | PRIV | |
| EPICS | Emergency Preparedness Incident Command Stimulation | FEMA | |
| EPL | Evaluated Products List | FEMA | |
| EPLO | Emergency Preparedness Liaison Officer | FEMA | |
| EPM | Environmental Planning and Historic Preservation Program Manager | DHS | |
| EPMS | Environmental Portable Monitoring System | FEMA | |
| EPO | Environmental Protection Officer | FEMA | |
| EPOC | Emergency Point(s) of Contact | FEMA | |
| EPOC | Emergency Preparedness Operations Center | FEMA | |
| EPP | environmentally preferable | DHS | |
| EPP | Employee Personal Page | FEMA | |
| EPP | Executive Potential Program | FEMA | |
| EPPC | Emergency Prevention and Preparedness Council | FEMA | |
| EPPM | Emergency Planning, Preparedness, and Mobilization | FEMA | |
| EPPM | Environmental Planning Program Manager | FEMA | |
| EPR | Emergency Preparedness and Response | DHS | |
| EPS | Encapsulated PostScript | FEMA | |
| EPSCoR | Experimental Program to Stimulate Competitive Research | FEMA | |
| EPW | Exercise Planning Workshop | FEMA | |
| EPZ | Emergency Planning Zone | FEMA | |
| EQPCE | Earthquake Preparedness Center of Expertise | FEMA | |
| EQPI | Equipment Inspector | FEMA | |
| EQPM | Equipment Manager | FEMA | |
| EQTR | Equipment Time Recorder | FEMA | |
| EQUIP | Earthquake Impacts Projection (Model) | FEMA | |
| E-Quip | Electronic Questionnaire for Investigation Processing | FEMA | |
| ER | Emergency Relief | FEMA | |
| ER | Emergency Room | FEMA | |
| ER | Equal Rights | FEMA | |
| ER | Expedited Removal | CBP | ICE | |
| ERAMS | Environmental Radiation Ambient Monitoring System | FEMA | S&T | |
| ERB | Economic Resources Board | FEMA | |
| ERC | Emergency Response Coordinator | FEMA | |
| ERCG | Emergency Response Coordination Group | FEMA | |
| ERCP | Emergency Response Concept Plan | FEMA | |
| ERDA | Energy Research and Development Administration | FEMA | |
| ERDC | Engineer Research and Development Center [United States Army] | S&T | |
| ERDEC | Edgewood Research, Development and Engineering Center | FEMA | |
| ERF | Emergency Response Facility | FEMA | |
| ERFOG | Emergency Responder Field Operating Guide | FEMA | |
| ERG | Emergency Relocation Group | FEMA | |
| ERL | Environmental Research Laboratories | FEMA | |
| ERLink | Emergency Response Link | FEMA | |
| ERM | Enforcement Removal Module | ICE | |
| ERM | Elevation Reference Mark | FEMA | |
| ERMS | Enterprise Records Management System | MGMT | |
| ERMS | Emergency Resource Management System | FEMA | |
| ERN | Emergency Response Network | FEMA | |
| ERO | Emergency Response Official | FEMA | |
| ERO | Equal Rights Office | FEMA | |
| ERO | Equal Rights Officer | FEMA | |
| EROS | Earth Resources Observing Satellite | FEMA | |
| ERP | Expedited Removal Process | ICE | |
| ERP | Elevation Reference Point | FEMA | |
| ERP | Emergency Response Plan | FEMA | |
| ERP | Enterprise Resource Planning | I&A | MGMT | |
| ERPA | Emergency Response Planning Area | FEMA | |
| ERPG | Emergency Response Guidelines | FEMA | |
| ERPS | Effluents Radiation Protection Section | FEMA | |
| ERPS | Emergency Response Planning Scenario | FEMA | |
| ERRO | Emergency Response/Recovery Office (USACE) | FEMA | |
| ERRS | Emergency and Rapid Response Services | FEMA | |
| ERS | Emergency Relocation Site | FEMA | |
| ERS | Executive Reporting System | FEMA | |
| ERSAC | Emergency Response Senior Advisory Committee | PLCY | |
| ERT | Environmental Response Team | FEMA | |
| ERT | Emergency Response Team | FEMA | TSA | |
| ERT | Evidence Response Team | FEMA | TSA | |
| ERT:BC | Emergency Response to Terrorism: Basic Concepts | FEMA | |
| ERT:SS | Emergency response to Terrorism: Self-Study | FEMA | |
| ERT-A | Emergency Response Team - Advance Element | FEMA | |
| ERT-N-NCR | National Emergency Response Team for the National Capital Region | FEMA | |
| ERT-S | Emergency Response Team Support Capability | FEMA | |
| ERV | Emergency Response Vehicle | FEMA | |
| ERW | Enhanced Radiation Weapon | FEMA | S&T | |
| ES | Emergency Support | FEMA | |
| ES | End System | FEMA | |
| ES | Engineering Section (Information Resources Division, FBIHQ) | FEMA | |
| ES | Environmental Specialist | FEMA | |
| ES | Executive Secretariat (see ESEC) | FEMA | |
| ESA | Endangered Species Act | FEMA | |
| ESA | essential supporting activity | MGMT | |
| ESAP | Energy Security and Assurance Program | CISA | |
| ESAR-VHP | Emergency System for the Advanced Registration of Volunteer Health Professionals | FEMA | |
| ESC | Executive Steering Committee | FEMA | |
| ESCAP | Electronic Crimes Special Agent Program | USSS | |
| ESD | Emergency Services Director | FEMA | |
| ESDP | Engineering Study Data Package | FEMA | |
| ESDPF | Engineering Study Data Package Facility | FEMA | |
| ESDRB | Emergency Services and Disaster Relief Branch | FEMA | |
| ESEC | Executive Secretariat | DHS | |
| ESEC | Office of the Executive Secretary | MGMT | |
| ESF | Emergency Support Function | FEMA | CISA | PLCY | |
| ESF 01 | Emergency Support Function - Transportation | FEMA | |
| ESF 02 | Emergency Support Function - Communications | FEMA | |
| ESF 03 | Emergency Support Function - Public Works and Engineering | FEMA | |
| ESF 04 | Emergency Support Function - Firefighting | FEMA | |
| ESF 05 | Emergency Support Function - Emergency Management | FEMA | |
| ESF 06 | Emergency Support Function - Mass Care, Emergency Assistance, Housing, and Human Services | FEMA | |
| ESF 07 | Emergency Support Function - Logistics Management and Resource Support | FEMA | |
| ESF 08 | Emergency Support Function - Public Health and Medical Services | FEMA | |
| ESF 09 | Emergency Support Function - Search and Rescue | FEMA | |
| ESF 10 | Emergency Support Function - Oil and Hazardous Materials Response | FEMA | |
| ESF 11 | Emergency Support Function - Agriculture and Natural Resources | FEMA | |
| ESF 12 | Emergency Support Function - Energy | FEMA | |
| ESF 13 | Emergency Support Function - Public Safety and Security | FEMA | |
| ESF 14 | Emergency Support Function - Long-term Community Recovery | FEMA | |
| ESF 15 | Emergency Support Function - External Affairs | FEMA | |
| ESFLG | Emergency Support Function Leaders Group | FEMA | |
| ESGR | Employer Support of the Guard and Reserve | USCG | |
| ESI | Electronically stored information | MGMT | |
| ESIC | Earth Science Information Center | FEMA | |
| ESIF | Emergency Services Interconnect Forum | FEMA | |
| ESL | English as a Second Language | FEMA | |
| ESM | Electronic Support Measures | FEMA | |
| ESM | Enterprise Security Manager | FEMA | |
| ESN | Electronic Serial Number | FEMA | |
| ESO | Energy Senior Official | FEMA | |
| ESOH | environment, safety, and occupational health requirements | MGMT | |
| ESP | Early Site Permit | FEMA | |
| ESP | Electric Service Priority | FEMA | |
| ESP | Extranet Secure Portal | FEMA | |
| ESPC | Energy Savings Performance Contract | MGMT | |
| ESS | Electronic Switching System | FEMA | |
| ESS | Emergency Services Sector | FEMA | |
| ESS | Environmental Sensor Station | FEMA | |
| ESS-SSA | Emergency Services Sector-Sector Specific Agency | FEMA | |
| ESSV | Emergency Support Service Vehicle | FEMA | |
| EST | Eastern Standard Time | DHS | |
| EST | Emergency Support Team | FEMA | |
| ESTA | Electronic System for Travel Authorization | CBP | TSA | PLCY | PRIV | |
| ESTD | Established | FEMA | |
| ESTED | Estimated Safe Time before Evacuation Decisions | FEMA | |
| ESTI | Emergency Services Training Institute | FEMA | |
| ET | Electronic Technician | FEMA | |
| ET | End of Transect (Line) | FEMA | |
| ETA | Employment and Training Administration | FEMA | |
| ETA | Estimated time of arrival | DHS | |
| ETAG | Employee Training Advisory Group | FEMA | |
| ETC | Emergency Transportation Center | FEMA | |
| etc | et cetera | FEMA | |
| ETD | Explosives Trace Detector | TSA | |
| ETD | Estimated time of departure | DHS | |
| ETE | Estimated Time Enroute | FEMA | |
| ETE | Evacuation Time Estimate | FEMA | |
| ETIC | Estimated Time in Commission | FEMA | |
| ETIS | Emergency Traffic Information System | FEMA | |
| ETJ | Extra-Territorial Jurisdiction (Limits) | FEMA | |
| ETL | Extraction, Transformation and Loading | I&A | MGMT | PLCY | PRIV | |
| ETO | Exercise and Training Officer | FEMA | |
| ETOC | Emergency Tactical Operations Center | FEMA | |
| ETP | Employment and Transition Plan | FEMA | |
| ETRMS | Emergency Transportation Resource Management System | FEMA | |
| ETS | Evacuation Time Study | FEMA | |
| ETT | Eligible Travel Trailer | FEMA | |
| EU | European Union | CBP | PLCY | |
| EU | Explosives Unit (BDC, FBI) | FEMA | |
| EUI | energy use intensity | DHS | |
| EVM | Earned Value Management | FEMA | |
| EVMS | earned value management system | MGMT | |
| EVT | Emergency Vehicle Technician | FEMA | |
| EVVE | Electronic Verification of Vital Events | USCIS | PLCY | PRIV | |
| EW | Emergency Worker | FEMA | |
| EWAC | Emergency Worker and Assistance Center | FEMA | |
| EWC | Emergency Worker Center | FEMA | |
| EWF | Electronic Warfare | FEMA | |
| EWI | Entry Without Inspection | CBP | ICE | USCG | |
| EWMDS | Emergency Worker Monitoring and Decontamination Station | FEMA | |
| EWO | Emergency War Order | FEMA | |
| EWP | Emergency Watershed Protection | FEMA | |
| EWRI | Environmental and Water Resources Institute | FEMA | |
| EX/IM Bank | Export/Import Bank of the United States | FEMA | |
| EXB | Export-Import Bank | I&A | |
| EXD | Explosives Division (S&T/EXD) | DHS | |
| EXPLAN | Exercise Plan | FEMA | |
| EXTIN | Extinguisher | FEMA | |
| F&STD | Fire and Safety Test Detachment | FEMA | |
| F/ERO | Federal Emergency and Mutual Aid Response Official | FEMA | |
| F/WRKGPS | For Work Groups | FEMA | |
| FAA | Federal Aviation Administration | DHS | |
| FAA | Foreign Assistance Act | FEMA | |
| FAADS | Federal Assistance Award Data System | FEMA | |
| FAAP | Foreign Airport Assessment Program | TSA | |
| FAAR | Facilitated After Action Report | FEMA | |
| FAAS | FEMA Automated Acquisition System | FEMA | |
| FAAT | FEMA Acronyms, Abbreviations, & Terms | FEMA | |
| FAAT | Fully Analytical Aerial Triangulation | FEMA | |
| FAB | FEMA Advisory Board | FEMA | |
| FAC | Foreign Air Carrier | TSA | |
| FAC | Family Assistance Center | FEMA | |
| FAC | Financial Attack Center | ICE | |
| FACA | Federal Advisory Committee Act | DHS | |
| FACL | Facilities Unit Leader | FEMA | |
| FACMAN | Facilities Management System | FEMA | |
| FACNET | Federal Acquisition Network | FEMA | |
| FACP | Fire Alarm Control Panel | FEMA | |
| FAC-P/PM | Federal Acquisition Certification for Program and Project Managers (*) | MGMT | |
| FAD | Foreign Animal Disease | FEMA | |
| FADED GIANT | Nuclear reactor radiological incident/ accident | FEMA | |
| FAE | Fuel Air Explosives | FEMA | |
| FAEST | Forward Area Emergency Support Trailers | FEMA | |
| FAI | Fire/Arson Investigation | FEMA | |
| FAIH | Federal Assistance to Individuals and Households | FEMA | |
| FAIR | Federal Activities Inventory Reform Act [of 1998] | OGC | |
| FAIR | Fair Access to Insurance Requirements | FEMA | |
| FAITS | FEMA Automated Inventory Tracking System | FEMA | |
| FALA | Faller A | FEMA | |
| FALB | Faller B | FEMA | |
| FALC | Faller C | FEMA | |
| FAM | Federal Air Marshal | TSA | |
| FAMA | Fire Apparatus Manufacturers' Association | FEMA | |
| FAMAS | Facility Accreditation Management and Administration System | FEMA | |
| FAMC | Fire Apparatus Manufactures’ Association | FEMA | |
| FAMIS | FEMA Audit Management Information System | FEMA | |
| FAMS | Federal Air Marshal Service (see OLE/FAMS) | TSA | |
| FANMAP | FEMA Automated Network Management Program | FEMA | |
| FAO | Federal Approving Officer | FEMA | |
| FAO | Federal Approving Official | FEMA | |
| FAO | Food & Agricultural Organization (UN) | FEMA | |
| FAOC | FEMA Alternate Operations Center | FEMA | |
| FAPRS | Federal Access Program Retrieval System | FEMA | |
| FAQ | Frequently Asked Questions | DHS | |
| FAR | Federal Acquisition Regulation | I&A | MGMT | |
| FAR | Federal Aviation Regulations | FEMA | |
| FARS | Financial Accounting and Reporting System | FEMA | |
| FAS | Freight Assessment System | TSA | |
| FAS | Federal Acquisition Service | FEMA | |
| FAS | Foreign Agricultural Service | FEMA | |
| FAS | Freely Associated States | FEMA | |
| FASSE | Federal Agency Support Service Element | FEMA | |
| FAST | Future Attribute Screening Technology | S&T | |
| FAST | Field Assessment Team | FEMA | |
| FAST | Free and Secure Trade [Initiative] | CBP | TSA | PLCY | PRIV | |
| FAST | Free and Secure Trade program | PLCY | |
| FAT | first article testing | MGMT | |
| FAX | Facsimile | FEMA | |
| FBAN | Fire Behavior Analyst | FEMA | |
| FBCI | Faith-Based and Community Initiatives | FEMA | |
| FBCO | Faith-Based and Community Organizations | FEMA | |
| FBFM | Flood Boundary and Floodway Map | FEMA | |
| FBI | Federal Bureau of Investigation | DHS | |
| FBIIC | Financial and Banking Information Infrastructure Committee | CISA | |
| FBINet | Federal Bureau of Investigation Network | I&A | |
| FBN | Federal Base Network | FEMA | |
| FBO | Fixed Base Operator | FEMA | |
| FBR | Fast Breeder Reactor | FEMA | |
| FC | Fire Control | FEMA | |
| FC | Fire Corps (Citizen Corps Program Partner administered by USFA) | FEMA | |
| FC | Federal Coordinator | OPS | |
| FCA | Farm Credit Administration | FEMA | |
| FCA | facility condition assessment | S&T | |
| FCBA | Federal Communications Bar Association | S&T | OGC | |
| FCC | Federal Coordinating Center | FEMA | |
| FCC | Federal Communications Commission | DHS | |
| FCD | Financial Crimes Division | FEMA | |
| FCDA | Federal Civil Defense Agency | FEMA | |
| FCE | Functional Capability Element | FEMA | |
| FCI | Facility Condition Index | FEMA | |
| FCIC | Federal Crop Insurance Corporation | FEMA | |
| FCIP | Federal Crime Insurance Program | FEMA | |
| FCIP | Federal Career Intern Program | FEMA | MGMT | |
| FCIS | Federal Crime Insurance System | FEMA | |
| FCM | Federal Communications Manager | FEMA | |
| FCMG | Fire Cache Manager | FEMA | |
| FCMSSR | Federal Committee for Meteorological Services and Supporting Research | FEMA | |
| FCO | Federal Coordinating Officer | FEMA | CISA | |
| F-codes | Charge codes for FEMA incidents | FEMA | |
| FCP | Federal Center Plaza | FEMA | |
| FCP | Field/Forward Command Post | FEMA | |
| FCRR | Fundamentals Course for Radiological Response | FEMA | |
| FCS | Farm Credit Service | FEMA | |
| FCS | Food and Consumer Service | FEMA | |
| FCSA | Fee-Charge System Administrator | FEMA | |
| FCT | Forward Coordinating Team | FEMA | |
| FD | Fire Department | FEMA | |
| FD | Foundation Data | FEMA | |
| FDA | Food & Drug Administration | FEMA | CISA | I&A | |
| FDC | Fire Department Connection | FEMA | |
| FDDI | Fiber Distributed Data Interface | I&A | MGMT | PLCY | |
| FDIC | Federal Deposit Insurance Corporation | DHS | |
| FDID | Fire Department Identification Number | FEMA | |
| FDL | Forensic Documents Laboratory | ICE | |
| FDMS | Federal Docketing Management System | OGC | |
| FDNS | Fraud Detection and National Security Unit | USCIS | |
| FDO | Flight Deck Officer | FEMA | |
| FDP | Federal Demonstration Project | FEMA | |
| FDRO | Foreign Disclosure and Release Officer | I&A | |
| FDSOA | Fire Department Safety Officers Association | FEMA | |
| FDSS | Federal Drug Seizure System | CBP | |
| FDUL | Food Unit Leader | FEMA | |
| FE | Fire Extinguisher | FEMA | |
| FE | Functional Exercise | FEMA | |
| FEA | Federal Enterprise Architecture | I&A | MGMT | |
| FEA | front-end analysis | MGMT | |
| FEB | Federal Executive Board | FEMA | |
| FEB | Federal Executive Branch | FEMA | |
| FEC | Facility Emergency Coordinator | FEMA | |
| FEC | Federal Election Commission | FEMA | |
| FEC | Federal Electronics Challenge | FEMA | |
| FECA | Federal Employees Compensation Act | FEMA | |
| FECC | Federal Emergency Communications Coordinator | FEMA | CISA | |
| FED – TRT | Federal Tactical Response Team | FEMA | |
| FEDCIRC | Federal Computer Incident Response Center | CISA | |
| FEDD | Flood Elevation Determination Docket | FEMA | |
| FEDMER | Federal Medical Evidence of Record | MGMT | |
| FED-STD | Federal Standard | FEMA | |
| FEEA | Federal Employee Education & Assistance | TSA | MGMT | |
| FEFFLA | Federal Employees Family Friendly Leave Act | FEMA | |
| FEGLI | Federal Employees' Group Life Insurance | MGMT | |
| FEHB | Federal Employees Health Benefits | MGMT | |
| FEHB | Federal Employee Health Benefits program | MGMT | |
| FEI | Federal Executive Institute | FEMA | |
| FEIMS | Fire and Explosion Investigation Management System | FEMA | |
| FEIS | Final Environmental Impact Statement | FEMA | |
| FEKC | FEMA Employee Knowledge Center | FEMA | |
| FELB | Felling Boss | FEMA | |
| FEMA | Federal Emergency Management Agency | DHS | |
| FEMAAR | Federal Emergency Management Agency Acquisition Regulation | FEMA | |
| FEMIS | Federal Emergency Management Information System | FEMA | |
| FEMO | Fire Effects Monitor | FEMA | |
| FEMSA | Fire and Emergency Manufacturers and Services Association | FEMA | |
| FEPA | Fair Employment Practices Agency | FEMA | |
| FERC | FEMA Emergency Response Capability | FEMA | |
| FERC | Federal Energy Regulatory Commission | CISA | S&T | |
| FERO | Federal Emergency Response Official | MGMT | |
| FERS | Federal Employees Retirement System | MGMT | |
| FES | Field Evaluation System | FEMA | |
| FESC | Federal Emergency Support Coordinator | FEMA | |
| FESHE | Fire and Emergency Services Higher Education | FEMA | |
| FEST | Foreign Emergency Support Team | FEMA | |
| FEVS | Federal Employee Viewpoint Survey | DHS | |
| FF | Firefighter | FEMA | |
| FFALC | Federal Fire and Aviation Leadership Council | FEMA | |
| FFAMIA | Federal Financial Assistance Management Improvement Act | FEMA | |
| FFARS | FEMA Facsimile and Record System | FEMA | |
| FFATA | Federal Funding Accountability and Transparency Act | FEMA | |
| FFC | FEMA Finance Center (OCFO) | FEMA | |
| FFCD | Full, Final, and Complete Disclosure | FEMA | |
| FFDO | Federal Flight Deck Officer | TSA | |
| FFE | Federal Field Exercise | FEMA | |
| FFFI&PP | Firefighter Fatality Investigation & Prevention Program (NIOSH) | FEMA | |
| FFI | Financial Fraud Institute | FLETC | |
| FFMIA | Federal Financial Management Improvement Act | FEMA | |
| FFMS | FEMA Frequency Management System | FEMA | |
| FFO | First Federal Official | FEMA | |
| FFRDC | Federally Funded Research and Development Center | S&T | OGC | |
| FFS | Federal Financial System | I&A | MGMT | |
| FFSTG | Federal Fire Service Task Group | FEMA | |
| FFT1 | Firefighter Type 1 | FEMA | |
| FFT2 | Firefighter Type 2 | FEMA | |
| FG | fiscal guidance | MGMT | |
| FGCC | Federal Geodetic Coordinating Committee | FEMA | |
| FGDC | Federal Geographic Data Committee | FEMA | |
| FGI | Foreign Government Information | FEMA | |
| FH | Fire Hydrant | FEMA | |
| FHA | Federal Housing Administration | FEMA | |
| FHA | Fire Hazards Analysis | FEMA | |
| FHA | Flood Hazard Area | FEMA | |
| FHAR | Flood Hazard Analyses Report | FEMA | |
| FHBM | Flood Hazard Boundary Map | FEMA | |
| FHCS | Federal Human Capital Survey | MGMT | |
| FHFB | Federal Housing Finance Board | FEMA | |
| FHH | Fire Hose House | FEMA | |
| FHM | Flood Hazard Mapping | FEMA | |
| FHML | Federal Hazardous Material Law | FEMA | |
| FHR | Fire Hose Rack | FEMA | |
| FHR | Fire Hose Reel | FEMA | |
| FHWA | Federal Highway Administration | FEMA | TSA | |
| FIA | Federal Insurance Administration | FEMA | |
| FIAB | Foreign Intelligence Advisory Board | I&A | |
| FIAMIS | Federal Insurance Administration Management Information System | FEMA | |
| FICA | Federal Insurance Contributions Act | FEMA | |
| FICC | Federal Interagency Coordination Council | S&T | |
| FICEMS | Federal Interagency Committee on Emergency Medical Services | FEMA | |
| FICO | Flood Insurance Claims Office | FEMA | |
| FICO | Flood Insurance Claims Officer | FEMA | |
| FIDA | FEMA Information Data and Analysis | FEMA | |
| FIDLER | Field Instrument for the Detection of Low Energy Radiation | FEMA | |
| FIE | foreign intelligence entity | I&A | |
| FIFMS | FEMA Integrated Financial Management System | FEMA | |
| FIG | Field Intelligence Groups | FEMA | |
| FIMO | Federal Incident Management Official | FEMA | |
| FIN | Fingerprint Identification Number | I&A | |
| FINCEN | Financial Center | FEMA | |
| FINCEN | Financial Crimes Enforcement Network | FLETC | ICE | |
| FinCEN | Financial Crimes Enforcement Network Project Gateway | I&A | |
| FINS | Federal Information Notices | FEMA | |
| FIO | Federal Information Officer | FEMA | |
| FIO | Fire Information Officer | FEMA | |
| FIOC | Federal Interagency Operations Center | FEMA | |
| FIP | Federal Information Processing | FEMA | |
| FIPNC | Flood Insurance Producers National Committee | FEMA | |
| FIPS | FOIA Information Processing System | PRIV | |
| FIPS | Federal Information Processing Standard | I&A | |
| FIR | Federal Inspection Report | FEMA | |
| FIR | Final Inspection Report | FEMA | |
| FIR | Flood Insurance Report | FEMA | |
| FIRB | Firing Boss | FEMA | |
| FIRESAT | Fire-Detection Satellite System (previously known as the Integrated Hazard Information System) | FEMA | |
| FIRESCOPE | Firefighting Resources of California Organized for Potential | FEMA | |
| FIRM | Flood Insurance Rate Map | FEMA | |
| FIRM-DLG | Flood Insurance Rate Map-Digital Line Graph | FEMA | |
| FIRMPD | FEMA Information Resources Management Procedural Directive | FEMA | |
| FIRMR | Federal Information Resources Management Regulation | FEMA | |
| FIS | Flood Insurance Study | FEMA | |
| FISA | Foreign Intelligence Surveillance Act | OGC | |
| FISH | Forensic Information System for Handwriting | USSS | S&T | |
| FISMA | Federal Information Security Management Act | I&A | MGMT | |
| FIST | Field Intelligence Support Team | USCG | |
| FIT | Failed Income Test | FEMA | |
| FIT | Financial Information Tool | FEMA | |
| FLAG | FEMA Logistics Advisory Group | FEMA | |
| FLAR | Forward Looking Airborne Radar | FEMA | |
| FLASH | Fellow Law Enforcement Agencies Securing the Homeland | ICE | |
| FLDPLN | Floodplains | FEMA | |
| FLEA | Fireline Explosive Advisor | FEMA | |
| FLEB | Fireline Blaster | FEMA | |
| FLETA | Federal Law Enforcement Training Accreditation | FEMA | |
| FLETC | Federal Law Enforcement Training Center | FEMA | |
| FLETC | Federal Law Enforcement Training Center (formerly Subcomponent under BTS) | DHS | |
| FLEX | Federal or FEMA Leadership Exercise | FEMA | |
| FlHB | Fire Line Hand Book | FEMA | |
| FLIR | Forward Looking Infrared Radar | CBP | TSA | |
| FLO | Fusion Liaison Officer | I&A | |
| FLRA | Federal Labor Relations Authority | FEMA | MGMT | OPA | |
| FLS | Flood Statement | FEMA | |
| FM | Financial Management | FEMA | |
| FM | Force Module | FEMA | |
| FM | Frequency Modulation | FEMA | |
| FMA | Field Mitigation Assistance | FEMA | |
| FMA | Floodplain Management Association | FEMA | |
| FMA | Flood Mitigation Assistance | FEMA | |
| FMAGP | Fire Management Assistance Grant | FEMA | USFA | |
| FMAGP | Fire Management Assistance Grant Program | FEMA | USFA | |
| FMANA | Fire Marshals Association of North America (see IFMA) | FEMA | |
| FMAP | Fire Management Assistance Program | FEMA | |
| FMAP | Flood Mitigation Assistance Program | FEMA | |
| FMC | Federal Maritime Commission | USCG | |
| FMC | Federal Management Circular | FEMA | |
| FMC | Federal Mobilization Center | FEMA | |
| FMC | Fully Mission Capable | FEMA | |
| FMCIMS | Flood Map Center Inventory Management System | FEMA | |
| FMCS | Federal Mediation and Conciliation Service | FEMA | OGC | |
| FMCSA | Federal Motor Carrier Safety Administration | TSA | CISA | |
| FMD | Foot and Mouth Disease | FEMA | |
| FMDC | Flood Map Distribution Center | FEMA | |
| FME | Federally Managed Exercise | FEMA | |
| FMH | Federal Meteorological Handbook | FEMA | |
| FmHA | Farmers Home Administration | FEMA | |
| FMHCSS | Federal Manufactured Home Construction and Safety Standards | FEMA | |
| FMLA | Family and Medical Leave Act | FEMA | |
| FMO | Fire Management Officer | FEMA | |
| FMP | Field Management Program | FEMA | |
| FMR | Fair Market Rental | FEMA | |
| FMS | Federal Medical Shelters | FEMA | CWMD | |
| FMS | Financial Management System | FEMA | |
| FMSIS | Flood Map Status Information Service | FEMA | |
| FMT | Field Monitoring Team | FEMA | |
| FMV | Fair Market Value | FEMA | |
| FMWC | Federal Multilingual Website Committee | USCIS | |
| FN | Foreign National | FEMA | |
| FNAMS | FEMA National Automated Message System | FEMA | |
| FNAPS | FEMA National Paging System | FEMA | |
| FNARS | FEMA National Radio System | FEMA | |
| FNF | Fixed Nuclear Facility | FEMA | |
| FNS | Food and Nutrition Services | FEMA | |
| FO | Field Office | FEMA | |
| FOB | Federal Office Building | FEMA | |
| FOBS | Field Observer | FEMA | |
| FOC | FEMA Operations Center | FEMA | |
| FOC | Forward Operations Center | FEMA | |
| FOC | Free of Charge | FEMA | |
| FOC | Full Operating Capability | FEMA | |
| FOD | Foreign Object Damage | FEMA | |
| FOF | Field Operating Facility | FEMA | |
| FOG | Field Operating Guide | FEMA | |
| FOG | Field Operation Guide | FEMA | |
| FOH | Federal Occupational Health | MGMT | |
| FOI | Functional Office Index | FEMA | |
| FOIA | Freedom of Information Act | FEMA | OGC | PRIV | |
| FONSI | Finding of No Significant Impact | FEMA | |
| FOP | Fugitive Operations Program | ICE | |
| FOP | Fraternal Order of Police | FEMA | |
| FORSCOM | Forces Command | FEMA | |
| FOS | Family of Services | FEMA | |
| FOS | Federal Operations Support | FEMA | |
| FOSA | Federal Operational/Operations Staging Area | FEMA | |
| FOSC | Federal On-Scene Coordinator/Commander | FEMA | |
| FOSET | finding of suitability [early transfer] | DHS | |
| FOSL | finding of suitability [lease] | DHS | |
| FOSS | Field Operating Site Setup | FEMA | |
| FOST | finding of suitability [transfer] | DHS | |
| FOUO | For official use only | DHS | |
| FOV | Field of View | FEMA | |
| FOX | fuel oxidizer explosive mixture | S&T | |
| FP | Fire Protection | FEMA | |
| FP | Force Protection | FEMA | |
| FP&S | Fire Prevention & Safety | FEMA | |
| FPA | Federal Preparedness Agency | FEMA | |
| FPBF | Fines, Penalties & Forfeiture | CBP | |
| FPC | Federal Power Commission | FEMA | |
| FPC | Federal Preparedness Circular | FEMA | |
| FPC | Federal Preparedness Coordinator | FEMA | |
| FPC | Final Planning Conference | FEMA | |
| FPCs | Federal Preparedness Coordinators | FEMA | |
| FPDL | Fire Protection Demonstration Lab | FEMA | |
| FPE | Fire Protection Engineering | FEMA | |
| FPEIS | Federal Programmatic Environmental Impact Statement | FEMA | |
| FPF | Federal Policy Fee | FEMA | |
| FPG | Federal Preparedness Guide | FEMA | |
| FPI | Floodplain Information Report | FEMA | |
| FPI | Foreign Person of Interest | FEMA | |
| FPMR | Federal Property Management Regulation | FEMA | |
| FPO | Federal Preservation Officer | FEMA | |
| FPO | Flood Potential Outlook | FEMA | |
| FPPS | Federal Personnel Payroll System | FEMA | |
| FPS | Federal Protective Service (ICE/FPS) | DHS | |
| FQI | Federal Quality Institute | FEMA | |
| FR | Field Reference | FEMA | |
| FR | Federal Register | USCG | OGC | |
| FRA | Federal Records Act | FEMA | |
| FRA | Federal Railroad Administration | TSA | CISA | |
| FRAC | First Responder Authorization Credential | FEMA | |
| FRATS | FEMA Recovery Action Tracking System | FEMA | |
| FRB | Federal Reserve Systems Board of Governors | DHS | |
| FRC | Fast Response Cutters | USCG | |
| FRC | Federal Regional Center | FEMA | |
| FRC | Federal Resource Coordinator | FEMA | |
| FRC | Federal Response Center | FEMA | |
| FRC | Federal Records Center | MGMT | |
| FRCA | Findings Requiring Corrective Action | FEMA | |
| FRCM | FEMA Regional Communications Manager | FEMA | |
| FRD | Formerly Restricted Data | FEMA | |
| FRERP | Federal Radiological Emergency Response Plan | FEMA | S&T | |
| FRESH | Fire, Rescue, Emergency, Safety, & Health | FEMA | |
| FRID | Flood Risk Directory | FEMA | |
| FRMAC | Federal Radiological Measurement and Assessment Center | CISA | S&T | |
| FRMAP | Federal Radiological Monitoring and Assessment Plan | CISA | S&T | |
| FRMT | Field Radiological Monitoring Team | FEMA | |
| FRN | Federal Reserve Note | USSS | |
| FRN | Federal Register Notice | FEMA | OGC | |
| FRN | FEMA Radio Network | FEMA | |
| FRO | Flood Response Office | FEMA | |
| FRP | facility response plan [oil discharge] | DHS | |
| FRP | Facility Response Plan | FEMA | |
| FRP | Federal Response Plan (see NRF) | FEMA | |
| FRPCC | Federal Radiological Preparedness Coordinating Committee | FEMA | |
| FRPG | Federal Response Planning Guidance | FEMA | |
| FRPI | First Responder Partnership Initiative | FEMA | |
| FRRATS | Federal Response and Recovery Automated Tracking System | FEMA | |
| FRRATS | FEMA Response & Recovery Applicant Tracking System | FEMA | |
| FRS | Federal Response Subcommittee | FEMA | |
| FRS | Federal Reserve System | CISA | |
| FRSA | Federal Railroad Safety Act | FEMA | |
| FRSD | First Responders and Small Departments | FEMA | |
| FRSGP | Freight Rail Security Grant Program | FEMA | |
| FRSSB | Facilities Radiological Safety and Safeguards Branch | FEMA | |
| FRTIB | Federal Retirement Thrift Investment Board | MGMT | |
| FRZ | Flight Restricted Zone | ICE | |
| FS | [United States] Forest Service [ESF-4] | FEMA | |
| FS | Feasibility Study | FEMA | |
| FSA | Flexible Spending Account | MGMT | |
| FSA | Farm Service Agency | FEMA | |
| FSA | FEMA/State Agreement | FEMA | |
| FSA | Fire Suppression Assistance | FEMA | |
| FSA | Forward Staging Areas | FEMA | |
| FSAR | Final Safety Analysis Report | FEMA | |
| FSB | Forward Support Base | FEMA | |
| FSC | Federal Support Center | FEMA | |
| FSC | FEMA Storage Center | FEMA | |
| FSC1 | Finance/Admin Section Chief | FEMA | |
| FSC2 | Finance/Admin Section Chief | FEMA | |
| FSD | Forensic Services Division | USSS | |
| FSD | Fire System Deficiency | FEMA | |
| FSD | Federal Security Director | TSA | S&T | |
| FSDO | Flight Service District Office | FEMA | |
| FSE | Full-Scale Exercise | FEMA | CISA | |
| FSG | Financial Services Group | FEMA | |
| FSH | Forest Service Handbook | FEMA | |
| FSIE | Fire Service Intelligence Enterprise | FEMA | |
| FSIS | Foreign Service Institute | I&A | |
| FSIS | Food Safety and Inspection Service | CISA | |
| FSIU | Field Support Intelligence Unit | FEMA | |
| FSL | Federal, State, Local | FEMA | CISA | |
| FSLC | Federal Senior Leadership Council | FEMA | |
| FSLIC | Federal Savings and Loan Insurance Corporation | FEMA | |
| FSM | Federated States of Micronesia | FEMA | |
| FSN | Federal Stock Number | FEMA | |
| FSN | FEMA Switched Network | FEMA | |
| FSO | Free Space Optics | FEMA | |
| FSR | Financial Status Report | FEMA | |
| FSS | Family Support Services | FEMA | |
| FSS | Federal Supply Service | FEMA | |
| FSSA | Flight School Security Awareness | TSA | |
| FSSC | Fleet Surveillance Support Command | ICE | |
| FSTC | Foreign Science Technology Center (United States Army) | FEMA | |
| FSTS | Federal Secure Telephone System | FEMA | |
| FSVS | FEMA Secure Video System | FEMA | |
| FSX | Full Scale Exercise | FEMA | |
| ft | foot/feet | FEMA | |
| FT | Full-Time | FEMA | |
| ft/min | feet per minute | FEMA | |
| ft3/min | cubic feet per minute | FEMA | |
| FTA | Federal Transit Administration | FEMA | TSA | |
| FTAA | Free Trade Area of the Americas | ICE | |
| FTC | Federal Training Coordinator | TSA | |
| FTC | Federal Trade Commission | DHS | |
| FTC | Field Team Coordinator | FEMA | |
| FTD | Federal Travel Directory | FEMA | |
| FTE | Full-Time Employees | FEMA | |
| FTE | Full-time Equivalent | FEMA | MGMT | OPA | |
| FTO | Foreign Terrorist Organizations | I&A | |
| FTP | File Transfer Protocol | I&A | MGMT | |
| FTS | Federal Technology Service | FEMA | |
| FTS | Forms Tracking System | FEMA | |
| FTS | Federal Telecommunications (or Telephone) System (or Service) | FEMA | MGMT | |
| FTSS | Federal Training Support Staff | TSA | |
| FTTTF | Foreign Terrorist Tracking Task Force | I&A | |
| FTX | Field Training Exercise | FEMA | |
| FTZ | Foreign Trade Zone | CBP | |
| FUM1 | Fire Use Manager 1 | FEMA | |
| FUM2 | Fire Use Manager 2 | FEMA | |
| FUNC | Functional | FEMA | |
| FW | Fire Weather | FEMA | |
| FWAN | FEMA Wide Area Network | FEMA | |
| FWBM | Fixed Wing Base Manager | FEMA | |
| FWCA | Fish and Wildlife Coordination Act | FEMA | |
| FWD | Forward | FEMA | |
| FWP | Federal Women’s Program | FEMA | |
| FWPCA | Federal Water Pollution Control Act | FEMA | |
| FWPT | Fixed Wing Parking Tender | FEMA | |
| FWS | United States Fish and Wildlife Service | FEMA | USCG | |
| FX | Functional Exercise | FEMA | |
| FY | Fiscal Year | DHS | |
| FYHSP | Future Years Homeland Security Program | MGMT | |
| FYI | For Your Information | FEMA | |
| FZ | Flood Zone | FEMA | |
| FZDC | Flood Zone Determination Company | FEMA | |
| G&T | Office of Grants and Training | FEMA | |
| GA | General Adjuster | FEMA | |
| GA/FBO | General Aviation/Fixed-Base Operations | FEMA | |
| GAAP | Generally Accepted Accounting Principles | FEMA | |
| GAAS | Generally Accepted Auditing Standards | FEMA | |
| GAAWG | General Aviation Airports Working Group | TSA | |
| GACC | Geographic Area Coordination Center | FEMA | |
| GACG | Geographic Area Coordinating Group | FEMA | |
| GADCOI | Global Air Domain Community of Interest | PLCY | |
| gal | gallon | FEMA | |
| GAL | Global Access List | MGMT | |
| GAMA | General Aviation Manufacturers Association | TSA | |
| GAN | Grant Adjustment Notice | FEMA | |
| GANTSEC | Greater Antilles Section | ICE | USCG | |
| GAO | General Accounting Office | FEMA | |
| GAO | Government Accountability Office | DHS | |
| GAR | Governor’s Authorized Representative | FEMA | |
| GARS | Global Area Reference System | FEMA | |
| GB | Gigabyte | FEMA | |
| GBL | Government/General Bill of Lading | FEMA | |
| GBPS | Gigabytes Per Second | FEMA | |
| GC | General Counsel (see also OGC) | FEMA | OGC | |
| GCC | Government Coordinating Council | FEMA | |
| GCCS | Global Command and Communications System | FEMA | |
| GCE | Government Cost Estimate | FEMA | |
| GCF | Ground Concentration Factor | FEMA | |
| GCO | Grant Coordinating Officer | FEMA | |
| GCOA | Gross Consequence of Attack | FEMA | |
| GCOS | Global Climate Observing System | FEMA | |
| GCR | Gulf Coast Region | FEMA | |
| GCR | Gulf Coast Region, Recovery and Rebuilding of the | DHS | |
| GCS | Ground Control Station | FEMA | |
| GD&A | Grant Development and Administration | FEMA | |
| GDIN | Global Disaster Information Network | FEMA | |
| GDM | Geospatial Data Model | FEMA | |
| GDNP | Gross Domestic National Product | FEMA | |
| GDS | Geographic Display System | FEMA | |
| GDSS | Global Decision Support System | FEMA | |
| GDT | Ground Data Terminal | FEMA | |
| GE | General Emergency | FEMA | |
| Ge (Li) | Lithium Drifted Germanium | FEMA | |
| GEA | Geospatial Enterprise Architecture | FEMA | |
| GEIA | Government Electronic and Information Technology Association | CISA | |
| GEMA | Georgia Emergency Management Agency | FEMA | |
| GEMINI | Global Emergency Management Information Network Initiative | FEMA | |
| GEMS | Global Emergency Management System | FEMA | |
| GEOCC | Government Emergency Operations Coordination Center | FEMA | |
| GeoTIFF | Georeferenced Tagged Image File Format | FEMA | |
| GER | Global Emergency Response | FEMA | |
| GES | Global Enrollment System | CBP | ICE | USCIS | I&A | PLCY | PRIV | |
| GETA | Government Emerging Technology Alliance | FEMA | |
| GETS | Government Emergency Telecommunications Service | FEMA | CISA | |
| GFE | Government-Furnished Equipment | FEMA | |
| GFI | Government-Furnished Information | FEMA | |
| GFIP | Group Flood Insurance Policy | FEMA | |
| GFIRST | Government Forum of Incident Response and Security Teams | USSS | CISA | S&T | |
| GFM | Generic Financial Module (NEMIS) | FEMA | |
| GFM | Government-Furnished Material | FEMA | |
| GGI | Global Geospatial Intelligence | FEMA | |
| GGI&S | Global Geospatial Information and Services | FEMA | |
| GHAD | Geologic Hazard Abatement District | FEMA | |
| GHG | greenhouse gas | DHS | |
| GI | Geographic Information | FEMA | |
| GI | Ground Infantry | FEMA | |
| GIF | Graphical Image Format | DHS | (Video) Terms & Acronyms - Secure Digital Life #99 |
| GIF | Graphics Interchange Format | FEMA | |
| GIG | Global Information Grid | I&A | |
| GIL | Grant-In-Lieu | FEMA | |
| GILS | Government Information Locator Service, | FEMA | |
| GIS | Geographic Information System(s) | FEMA | |
| GIS | Geospatial Information System | FEMA | |
| GISS | GIS Specialist | FEMA | |
| GISWG | Global Infrastructure and Standards Working Group | FEMA | |
| GIWG | Global Intelligence Working Group | FEMA | |
| GIWW | Gulf Intracoastal Waterway | FEMA | |
| GLD | General Law Division | OGC | |
| GLPAC | Great Lakes Pilotage Advisory Committee | USCG | |
| GLWRM | Great Lakes Wave Run-up Model | FEMA | |
| GM | Guidance Memorandum | FEMA | |
| G-M | Geiger-Mueller (radiation detector) | FEMA | |
| GMCOI | Global Maritime Community of Interest | PLCY | |
| GMDSS | Global Maritime Distress and Safety System | FEMA | |
| GMF | Government Master File | FEMA | |
| GML | Geographic Markup Language | FEMA | |
| GMO | Genetically Modified Organism | FEMA | |
| GMO | Geospatial Management Office | FEMA | |
| GMR | Graduated Mobilization Response | FEMA | |
| GMS | Grant Management Specialists | FEMA | |
| GMS | Grants Management System | FEMA | |
| GMSA | global maritime situational awareness | PLCY | |
| GMT | Greenwich Mean Time (aka: "ZULU Time") | FEMA | |
| GNDA | Global Nuclear Detection Architecture | CWMD | |
| GNIS | Geographic Names Information System | FEMA | |
| GOALS | Government On-Line Accounting Link System | FEMA | |
| GOES | Global Online Enrollment System | CBP | |
| GOGO | Government-Owned, Government-Operated | FEMA | |
| GOM | Gulf of Mexico | FEMA | |
| GOMEX | Gulf of Mexico | FEMA | |
| GOSC | Global Operations Security Center | FEMA | |
| GOTS | Government Off the Shelf | I&A | MGMT | |
| GOV | Government Owned Vehicle | FEMA | |
| GP | Grant Programs, Office of (FEMA/GP) | DHS | |
| GPCI | Geographical Physician Cost Index | FEMA | |
| GPD | Grant Programs Directorate | FEMA | |
| GPEA | Government Paperwork Elimination Act | FEMA | |
| GPL | General Population Level | FEMA | |
| GPL | General Population Limit | FEMA | |
| GPLD | Government Property Lost or Damaged | FEMA | |
| GPM | gallons per minute | FEMA | |
| GPMRC | Global Patient Movement Requirements Center | FEMA | |
| GPO | Government Printing Office | FEMA | MGMT | OPA | |
| GPRA | Government Performance and Results Act | FEMA | |
| GPS | Global Positioning System | FEMA | USCG | S&T | |
| GRASS | Geographic Resources Analysis and Support System | FEMA | |
| GRP | Grant Reporting Portal | FEMA | |
| GRS | general record schedule | MGMT | |
| GRS | Geodetic Reference System | FEMA | |
| GS | General Schedule | MGMT | |
| GS | Geological Survey | FEMA | |
| GS | Geo-Stationary | FEMA | |
| GS | Ground Support | FEMA | |
| GSA | General Services Administration | DHS | |
| GSAAR | General Services Administration Acquisition Regulation | FEMA | |
| GSACR | GSA Communications Representative | FEMA | |
| GSB | GIS Solutions Branch | FEMA | |
| GSE | Government-Sponsored Enterprise | FEMA | |
| GSSO | Government Special Access Program Security Officer | MGMT | |
| GST | Ground Support Team | FEMA | |
| GSUL | Ground Support Unit Leader | FEMA | |
| GTA | Government Travel Account | FEMA | |
| GTA | Government Travel Authorization | FEMA | |
| GTC | Government Travel Card | FEMA | |
| GTM | Government Technical Monitor | FEMA | |
| GTR | Government Technical Representative | FEMA | |
| GTR | Government Transportation Request | FEMA | |
| GTS | Global Telecommunications System | FEMA | |
| GUI | Geographical User Interface | FEMA | |
| GUI | Graphical User Interface | I&A | MGMT | |
| GUIRR | Government-University-Industry Research Roundtable | S&T | |
| GVO | Green Vinyl Overboot | FEMA | |
| GWA | Government Wide Accounting | FEMA | |
| GWAC | Government-wide Acquisition Contract | I&A | MGMT | |
| GZ | Ground Zero | FEMA | |
| H&H | Hydraulics and Hydrology | FEMA | |
| H&H | Hydrologic and Hydraulic (Analyses) | FEMA | |
| HA | Housing Assistance | FEMA | |
| HAB | Hostile Action Based | FEMA | |
| HADT | Hawaiian Daylight Time (GMT - 9) | FEMA | |
| HAG | Highest Adjacent Ground [grade] | FEMA | |
| HALE | High Altitude Long Endurance (see also MALE) | USCG | |
| HAMMER | Hazardous Materials Management and Emergency Response | FEMA | |
| HAMMER | Hazardous Agent Mitigation and Medical Emergency Response | USSS | S&T | |
| HAN | Health Alert Network | FEMA | |
| HAP | hazardous air pollutant | DHS | |
| HAP | Hazard Abatement Plan | FEMA | |
| HARN | High Accuracy Reference Network | FEMA | |
| HARTline | Hillsborough Area Regional Transit Authority (Florida) | FEMA | |
| HAS | Homeland Security Act [of 2002] | DHS | |
| HASP | Health and Safety Plan | FEMA | |
| HAST | Hawaiian Standard Time (GMT - 10) | FEMA | |
| HAST | Humanitarian Assistance Survey Team | FEMA | |
| HAWAS | Hawaiian Warning System | FEMA | |
| HAZCAT | Hazard Categorizing | FEMA | |
| HAZCOM | Hazard Communication | FEMA | |
| HAZMAT | Hazardous Material(s) | FEMA | S&T | PLCY | |
| HAZMIN | Hazard Minimization | FEMA | |
| HAZMIT | Hazard Mitigation | FEMA | |
| HAZUS | Hazards United States | FEMA | CISA | |
| HAZUS-MH | Hazards - United States (Multi-Hazard) | FEMA | |
| HAZWOPER | Hazardous Waste Operation and Emergency Response | FEMA | |
| HB | Health Benefit | FEMA | |
| HBCU | Historically Black College and Universities | S&T | |
| HBX | High-Blast Explosive | FEMA | |
| HC | Human Capital | FEMA | |
| HCA | High Consequence Area | FEMA | |
| HCC | Homeland Security Intelligence Council Coordinating Committee | I&A | |
| HCF | Height Correction Factor | FEMA | |
| HCFA | Health Care Financing Administration | FEMA | |
| HCFC | hydro-chlorofluorocarbons | DHS | |
| HCFSA | Health Care Flexible Spending Account | FEMA | |
| HCIB | Human Capital Investment Branch | FEMA | |
| HCO | see OCHCO | MGMT | |
| HCOP | Human Capital Operational Plan | FEMA | |
| HCP | health care provider | DHS | |
| HCQC | Health Care Quality Committee | MGMT | |
| HCTS | Hazardous Cargo Transportation Security | USCG | |
| HD | Hurricane Day | FEMA | |
| Hdbks | Handbooks | FEMA | |
| HDD | Heating Degree Days | FEMA | |
| HDER | Homeland Defense Equipment Reuse | FEMA | |
| HDP | Hurricane Destruction Potential | FEMA | |
| HDTC | Homeland Defense Technology Center | FEMA | |
| HE | High Explosive | FEMA | |
| HEAR | Hospital Emergency Administrative Radio | FEMA | |
| HEB1 | Helibase Manager (4+) | FEMA | |
| HEB2 | Helibase Manager (1-3) | FEMA | |
| HEC | Hydrologic Engineering Center | FEMA | |
| HECM | Helicopter Crewmember | FEMA | |
| HEICS | Hospital Emergency Incident Command System | FEMA | |
| HELB | Helicopter Boss | FEMA | |
| HELM | Helicopter Manager | FEMA | |
| HELP | Health Emergencies in Large Populations | FEMA | |
| HEMP | High Altitude Electromagnetic Pulse | FEMA | |
| HEOC | Hospital Emergency Operations Center (medical) | FEMA | |
| HEPA | High Efficiency Particulate Air (as in filters) | FEMA | |
| HERN | Hospital Emergency Radio Network | FEMA | |
| HERO | Hazards of Electromagnetic Radiation to Ordnance | FEMA | |
| HERS | Helicopter Rappel Spotter | FEMA | |
| HERT | Hospital Emergency Response Team | FEMA | |
| HES | Hurricane Evacuation Study | FEMA | |
| HESM | Helispot Manager | FEMA | |
| HET | Headquarters Emergency Transportation | FEMA | |
| HETA | Homeland Environment and Threat Analysis Division | I&A | |
| HEU | Highly Enriched Uranium | FEMA | |
| HEW | United States Department of Health, Education and Welfare | FEMA | |
| HF | High Frequency | FEMA | |
| HF | hydrogen fluoride | FEMA | |
| HF/SSB | High Frequency / Single Side Band | FEMA | |
| HFC | hydro-fluorocarbons | DHS | |
| HFD | Human Factors Division (S&T/HFD) | DHS | |
| HFE | human factors engineering | MGMT | |
| HFSC | Home Fire Sprinkler Coalition | FEMA | |
| HgI2 | mercuric iodide | FEMA | |
| HHA | High Hazard Area | FEMA | |
| HHC | Headquarters and Headquarters Company | FEMA | |
| HHD | Headquarters and Headquarters Detachment | FEMA | |
| HHMD | Hand-Held Metal Detector | TSA | |
| HHS | United States Department of Health and Human Services | DHS | |
| HHS SERT | Health and Human Services Secretary’s Emergency Response Teams | FEMA | |
| HHSEOC | Health and Human Services Emergency Operations Center | FEMA | |
| HHW | Household Hazardous Wastes | FEMA | |
| HIC | Hydrologist-in-Charge | FEMA | |
| HIDTA | High Intensity Drug Trafficking Area | ICE | |
| HIP | Housing Improvement Program | FEMA | |
| HIPAA | Health Insurance Portability and Accountability Act | PRIV | |
| HIPDB | Healthcare Integrity & Protection Data Bank | FEMA | |
| HIPS | Homeland Innovative Prototypical Solutions | S&T | |
| HIRA | Hazard Identification and Risk Assessment | CISA | |
| HITRAC | Homeland Infrastructure Threat and Risk Analysis Center | CISA | S&T | I&A | |
| HITRON | Helicopter Interdiction Tactical Squadron | USCG | |
| HITS | High Impact Technology Solutions | S&T | |
| HL | Help Line | FEMA | |
| HL | Hotline | FEMA | |
| HLCO | Helicopter Coordinator | FEMA | |
| HLD | Homeland Defense | S&T | MGMT | |
| HLDBU | Homeland Defense Budget Unit | FEMA | |
| HLS | Hurricane Local Statement | FEMA | |
| HLS | Homeland Security | S&T | MGMT | |
| HLS-CAM | Homeland Security Comprehensive Assessment Model | FEMA | |
| HLSEA | DHS Homeland Security Enterprise Architecture | MGMT | |
| HLSEA | Homeland Security Enterprise Architecture | S&T | MGMT | |
| HLT | Hurricane Liaison Team | FEMA | |
| HLW | High-Level Waste | FEMA | |
| HM | Hazard Mitigation | FEMA | |
| HM | Hazardous Materials | FEMA | |
| HMA | Hazardous Materials Accident | FEMA | |
| HMAC | Hazardous Materials Advisory Council | FEMA | |
| HMC | Hazard Mitigation Coordinator | FEMA | |
| HME | Hazardous Materials Endorsement | TSA | |
| HME | Health, Medical, and Environmental | FEMA | |
| HME | homemade explosive | S&T | |
| HMEP | Hazardous Materials Emergency Preparedness | FEMA | |
| HMER | Hazardous Material Emergency Response | FEMA | |
| HMG | Hazard Mitigation Grant | FEMA | |
| HMGP | Hazardous Mitigation Grants Program | FEMA | |
| HMIX | Hazardous Materials Information Exchange | FEMA | |
| HMMWV | Highly Mobile Multipurpose Wheeled Vehicle | FEMA | |
| HMRT | Hazardous Materials Response Team | FEMA | |
| HMRU | Hazardous Materials Response Unit (FBI) | FEMA | |
| HMST | Hazard Mitigation Survey Team | FEMA | |
| HMTA | Hazardous Materials Transportation Act | FEMA | |
| HMTAP | Hazard Mitigation Technical Assistance Plan | FEMA | |
| HMTAP | Hazard Mitigation Technical Assistance Program | FEMA | |
| HMTUSA | Hazardous Materials Transportation Uniform Safety Act | FEMA | |
| HNAT | Human Needs Assessment Team | FEMA | |
| HNT | Hostage Negotiation Team | FEMA | |
| HOB | Height of Burst | FEMA | |
| HOH | Head Of Household | FEMA | |
| HOO | [NRC] Headquarters Operations Officer | FEMA | |
| HOPWA | Housing Opportunities for Persons With AIDS | FEMA | |
| HOTMAC | High Order Turbulence Model for Atmospheric Circulation | FEMA | |
| HP | Health Physicist | FEMA | |
| HP | Historic Preservation | FEMA | |
| HP | Horsepower | FEMA | |
| HP | Hurricane Program | FEMA | |
| HPAC | Hazard Prediction and Assessment Capability | FEMA | |
| HPC | High Probability of Completion | FEMA | |
| HPC | Hydrometeorological Prediction Center | FEMA | |
| HPCC | High-performance computing and communications | FEMA | |
| HPPM | Health Promotion and Preventive Medicine [United States Army Center for] | S&T | CWMD | |
| HPRDS | Human Portable Radiation Detection System | CWMD | |
| HPRP | Home Protection Roofing Program | FEMA | |
| HPSI | High Pressure Safety Injection | FEMA | |
| HPT | Health Physics Technician | FEMA | |
| HPXe | high-pressure xenon | FEMA | |
| HQ | Headquarters | FEMA | |
| HQAMC | Headquarters Air Mobility Command | FEMA | |
| HQDA | Headquarters, Department of the Army | FEMA | |
| HQUSACE | Headquarters, United States Army Corps of Engineers | FEMA | |
| HR | Home Repair | FEMA | |
| hr | hour | FEMA | |
| HR | House of Representatives | FEMA | |
| HR | Human Resources | FEMA | |
| HRA | health risk assessment | MGMT | |
| HRAP | Helicopter Rappeller | FEMA | |
| HRCQ | Highway Route Controlled Quantity | FEMA | |
| HRD | Human Resources Division | FEMA | |
| HRDI | High Resolution Doppler Imager | FEMA | |
| HRLD | Human Rights Law Division | ICE | |
| HRMS | Human Resources Management System | MGMT | |
| HROA | human resources operations audit | MGMT | |
| HRPT | High Resolution Picture Transmission | FEMA | |
| HRS | Hours | FEMA | |
| HRSA | Health Resources & Services Administration | CISA | |
| HRSAN | Health Resources Services Administration (Federal) | FEMA | |
| HRSP | Human Resource Specialist | FEMA | |
| HRT | Hostage Rescue Team | FEMA | |
| HRT | Hydraulic Rescue Tool | FEMA | |
| HRV | Human Rights Violator/Violation | ICE | |
| HS | Homeland Security | FEMA | |
| HS | Human Services | FEMA | |
| HSA | Homeland Security Advisor | FEMA | |
| HSAC | Homeland Security Advisory Committees (PLCY/HSAC) | DHS | |
| HSAC | Homeland Security Advisory Council | FEMA | |
| HSAP | Homeland Security Assistance Program | FEMA | |
| HSARPA | Homeland Security Advanced Research Project Agency | S&T | |
| HSAS | Homeland Security Advisory System | DHS | |
| HSAT | Homeland Security Action Team | FEMA | |
| HSC | Homeland Security Center | FEMA | |
| HSC | Homeland Security Council (formerly OHS) | FEMA | |
| HSC | Health Service Command | FEMA | |
| HSCG | Homeland Security Coordination Group | FEMA | |
| HSD | Human Services Department | FEMA | |
| HSDF | Homeland Security Dialogue Forum | CISA | |
| HSDN | High Seas Drift Nets | USCG | |
| HSDN | Homeland Secure Data Network | I&A | MGMT | |
| HSEC SINs | Homeland Security Standing Information Needs | I&A | |
| HSEEP | Homeland Security Exercise and Evaluation Program | CISA | |
| HSEES | Hazardous Substances Emergency Event Surveillance (Program) | FEMA | |
| HSELP | Homeland Security Executive Leadership Program | FEMA | |
| HSGP | Homeland Security Grant Program | FEMA | |
| HSI | human systems integration | MGMT | |
| HSI | Homeland Security Institute | FEMA | |
| HSIA | Homeland Security Industry Alliance | PLCY | |
| HSIC | Homeland Security Intelligence Council | I&A | |
| HSIN | Homeland Security Information Network | I&A | |
| HSIN | Homeland Security Information Network (formerly JRIES) | CISA | I&A | OPS | PLCY | |
| HSIN Intel | Homeland Security Information Network Intelligence Community of Interest | I&A | |
| HSIPF | homeland security intelligence priorities framework | I&A | |
| HSIPP | Homeland Security Integrated Planning Process | CISA | |
| HSIR | Homeland Security Intelligence Report | I&A | |
| HSL | Health and Safety Laboratory | FEMA | |
| HSLA | Homeland Security Leadership Alliance | FEMA | |
| HSLD | Historic Shoreline Location Database | FEMA | |
| HSLRB | Homeland Security Labor Board | DHS | |
| HSNTP | Homeland Security National Training Program | FEMA | |
| HSO | Human Services Officer | FEMA | |
| HSOC | Homeland Security Operations Center [see new name under NOC] | DHS | |
| HSOMB | Homeland Security Operations Morning Brief | FEMA | |
| HSPCD | Historic Shoreline Positional Change Database | FEMA | |
| HSPD | Homeland Security Presidential Directive | DHS | FEMA | CISA | S&T | I&A | |
| HSPI | Homeland Security Policy Institute | FEMA | |
| HSPO | (DHS) Human Subjects Protection Official | FEMA | |
| HSPTAP | Homeland Security Preparedness Technical Assistance Program | FEMA | |
| HSS | Health Service Support | FEMA | |
| HSS | Hyperspectral Sensor System | FEMA | |
| HSSP | Homeland Security Standards Panel | PLCY | |
| HSSTAC | Homeland Security Science and Technology Advisory Committee | FEMA | |
| HSTA | Homeland Security Threat Assessment | FEMA | |
| HSTF | Homeland Security Task Force | FEMA | |
| HSTF-SE | Homeland Security Task Force - Southeast | DHS | |
| HSTS | Homeland Security Training System | FEMA | |
| HSTTIG | Homeland Security Terrorist Threat Intelligence Group | I&A | |
| HSUS | The Humane Society of the United States | FEMA | |
| HTCI | High-Tech Crime Investigation | FEMA | |
| HTGR | High-Temperature Gas-Cooled Reactor | FEMA | |
| HTMG | Helitorch Manager | FEMA | |
| HTML | Hypertext Markup Language | DHS | |
| HTMM | Helitorch Mixmaster | FEMA | |
| HTPT | Helitorch Parking Tender | FEMA | |
| HTRT | Hiring & Transition Response Team | FEMA | |
| HTS | High Temperature Superconductor | S&T | |
| HTTP | Hypertext Transfer Protocol | DHS | |
| HTUA | High Threat Urban Area | TSA | CISA | |
| HUB | Historically Underutilized Business | FEMA | |
| HUBZone | Historically Under-Utilized Business Zone | FEMA | |
| HUD | United States Department of Housing and Urban Development | DHS | |
| HUG | HAZUS User Group | FEMA | |
| HUMINT | Human Intelligence | FEMA | |
| HURCON | Hurricane Condition | FEMA | |
| HUREVAC | Hurricane Evacuation | FEMA | |
| HV/HR | High value/High risk | FEMA | |
| HVA | Hazard Vulnerability Analysis | FEMA | |
| HVAC | Heat, Ventilating, and Air Conditioning | FEMA | MGMT | |
| HVE | homegrown violent extremist | I&A | |
| HVSACO | handle via special access channels only material | MGMT | |
| HVT | High Value Target | CISA | |
| HWL | High Water Line | FEMA | |
| HWM | High Water Mark | FEMA | |
| HWP | Highway Watch Program | FEMA | |
| HWR | Heavy Water Reactor | FEMA | |
| Hz | Hertz (cycle per second) | FEMA | |
| I | Individual/Family | FEMA | |
| I | Iodine Exposure Intensity | FEMA | |
| I&A | Intelligence and Analysis | DHS | |
| I&A | Office of Intelligence and Analysis | MGMT | |
| I&P or I/P | Information and Planning | FEMA | |
| I&W | Indication and Warning | FEMA | CISA | |
| I/O | Input/Output | FEMA | |
| IA | In and around | FEMA | |
| IA | Individual Assistance | FEMA | |
| IA | Information Assurance | FEMA | |
| IA | Initial attack | FEMA | |
| IA | Internal Affairs | FEMA | |
| IA | Inter-agency | DHS | |
| IA | International Affairs (see OIA) | DHS | |
| IA (see I&A) | Information Analysis (former DHS Subcomponent) | I&A | |
| IAA | Interagency Agreement | FEMA | |
| IAAE | International Association of Airport Executives | TSA | PLCY | |
| IAAI | International Association of Arson Investigators | FEMA | |
| IAASP | International Association of Airport and Seaport Police | CBP | TSA | USCG | |
| IAB | Interagency Board | FEMA | |
| IABPFF | International Association of Black Professional Fire Fighters | FEMA | |
| IAC | Incident Action Council, formerly IIMG (NRP-CIS) | FEMA | |
| IAC | Incident Advisory Council | FEMA | |
| IAC | Information Analysis Center (DOD) | FEMA | |
| IAC | International Aviation Club | CBP | |
| IACET | International Association for Continuing Education and Training | FEMA | |
| IACG | Interagency Airspace Coordination Guide | FEMA | |
| IACNDR | Inter-American Committee for Natural Disaster Reduction | FEMA | |
| IACP | International Association of Chiefs of Police | FEMA | CISA | OPA | |
| IACUC | Institutional Animal Care and Use Committee | S&T | |
| IAD | Interagency Programs Division (S&T/IAD) | DHS | |
| IADP | Initial Attack Dispatcher | FEMA | |
| IAE | Integrated Acquisition Environment (eGovernment Initiative) | FEMA | |
| IAEA | International Atomic Energy Agency | CISA | S&T | |
| IAEGC | Interagency Electronic Grants Committee (Federal) | FEMA | |
| IAEM | International Association of Emergency Managers | FEMA | CISA | |
| IAFC | International Association of Fire Chiefs | FEMA | CISA | S&T | |
| IAFF | International Association of Fire Fighters | FEMA | |
| IAFIS | Integrated Automated Fingerprint Identification System | CBP | USCG | S&T | PLCY | |
| IAFPA | International Aviation Fire Protection Association | FEMA | |
| IAG | Interagency Advisory Group | FEMA | |
| IAHFF | International Association of Hispanic Firefighters | FEMA | |
| IAI | International Association for Identifications | USSS | |
| IAIP | Information Analysis and Infrastructure Protection (split into PREP and I&A October 2005) | DHS | |
| IALEIA | International Association of Law Enforcement Intelligence Analysts | FEMA | |
| IAM | Identity and Access Management | FEMA | |
| IAM | Incident Activity Manager | FEMA | |
| IANA | Intermodal Association of North America | CISA | |
| IAO | Individual Assistance Officer | FEMA | |
| IAP | Immigration Advisory Program | CBP | |
| IAP | Incident Action Plan | FEMA | |
| IAPH | International Association of Ports and Harbors | USCG | |
| IAPP | International Association of Privacy Professionals | CISA | PRIV | |
| IAQ | Indoor Air Quality | FEMA | |
| IARLJ | International Association of Refugee Law Judges | USCIS | |
| IARR | Interagency Resource Representative | FEMA | |
| IAS | International Assistance System | FEMA | |
| IASE | Information Assurance Support Environment (Dodd IA Portal) | FEMA | |
| IASIR | International Association of Security and Investigative Regulators | ICE | USCIS | |
| IASIU | International Association of Special Investigation Units | FEMA | |
| IAT | Incident Assessment Team | FEMA | |
| IATA | International Air Transport Association | TSA | |
| IATBOG | Interagency Air Tankers Base Operations Guide | FEMA | |
| IAVA | Information Assurance Vulnerability Alert | FEMA | |
| IAW | In accordance with | DHS | |
| IAWF | International Association of Wildland Fire | FEMA | |
| IBA | Incident Business Advisor | FEMA | |
| IBA1 | Incident Business Advisor Type 1 | FEMA | |
| IBA2 | Incident Business Advisor Type 2 | FEMA | |
| IBA3 | Incident Business Advisor Type 3 | FEMA | |
| IBAD | Interim Biological Agent Detector | FEMA | |
| IBC | Institutional Biosafety Committee | CWMD | |
| IBC | International Broadcast Center | FEMA | |
| IBC | International Building Code | FEMA | |
| IBD | Improvised Biological Device | FEMA | |
| IBDS | Integrated Biological Detection System | FEMA | |
| IBET | Integrated Border Enforcement Team | CBP | |
| IBHS | Institute for Business and Home Safety | FEMA | |
| IBIS | Interagency Border Inspection Services | FEMA | |
| IBIS | Interagency Border Inspection System | CBP | USCIS | PLCY | PRIV | |
| IBPAP | International Business Practices Advisory Panel | S&T | |
| IBS | Integrated Baseline System | FEMA | |
| IBSGP | Intercity Bus Security Grant Program | FEMA | |
| IBT | International Brotherhood of Teamsters | TSA | |
| IBWA | International Bottled Water Association | FEMA | |
| IC | Incident Command/Commander | FEMA | |
| IC | Information Collection | FEMA | |
| IC | Intelligence Community | DHS | I&A | |
| IC&V | Intelligent Collaboration and Visualization | FEMA | |
| ICAF | Industrial College of the Armed Forces | FEMA | |
| ICAHST | Interagency Center for Applied Homeland Security Technology | FEMA | |
| ICAO | International Civil Aviation Organization | CBP | TSA | CISA | |
| ICAP | Incident Communications Action Plan | FEMA | |
| ICAT | DHS Intelligence Crisis Action Team | I&A | |
| ICAV | Infrastructure Critical Asset Viewer | FEMA | |
| ICBM | Intercontinental Ballistic Missile | FEMA | |
| ICC | Incident Command Center | FEMA | |
| ICC | Increased Cost of Compliance | FEMA | |
| ICC | Information Control Cell | FEMA | |
| ICC | Intelligence Control Center | FEMA | I&A | |
| ICC | Interagency Coordination Council | CWMD | |
| ICC | International Code Council | FEMA | |
| ICCB | Intergovernmental Consultation and Coordination Board | FEMA | |
| ICCOH | Interagency Coordinating Committee On Hurricanes | FEMA | |
| ICCT | Incident Community Coordination Team | FEMA | |
| ICD | Improvised Chemical Device | CISA | |
| ICD | Institute of Chemical Defense | CISA | |
| ICD | Infrastructure Coordination Division | CISA | |
| ICDR | Interagency Committee on Disability Research | CRCL | I&A | |
| ICE | Immigration and Customs Enforcement, United States (formerly Bureau of) | DHS | |
| ICE | Interoperable Communications Equipment | FEMA | |
| ICE | U.S. Immigration and Customs Enforcement | MGMT | |
| ICE | United States Immigration and Customs Enforcement | MGMT | |
| ICEP | Incident Communications Emergency Plan | FEMA | |
| ICEPP | Incident Communications Emergency Policy and Procedures | FEMA | |
| ICER | Incident Communications Emergency Reference | PLCY | |
| ICF | Incident Command Facility | FEMA | |
| ICF | Insulating Concrete Forms | FEMA | |
| ICGP | Interoperable Communications Grant Program | FEMA | |
| ICHRO | Incident Command for High-rise Operations | FEMA | |
| ICIMPP | Integrated Civilian Industrial Mobilization Planning Process | FEMA | |
| ICISF | International Critical Incident Stress Foundation | FEMA | |
| ICITAP | International Criminal Investigative Training Assistance Program | FLETC | |
| ICLN | Integrated Consortium of Laboratory Networks | CISA | |
| ICMA | International City/County Management Association | FEMA | |
| ICML | Intelligence Community Markup Language | FEMA | |
| ICMOP | Integrated CONUS Medical Operations Plan | FEMA | |
| ICMSSR | Interdepartmental Committee for Meteorological Services and Supporting Research | FEMA | |
| ICODS | Interagency Committee on Dam Safety | FEMA | |
| ICP | Incident Command Post | FEMA | |
| ICP | Information Collection Plan | FEMA | |
| ICP | Integrated Cargo Processing | CBP | |
| ICPACC | Incident Communications Public Affairs Coordination Committee | FEMA | CISA | OPA | |
| ICPAE | Interagency Committee on Public Affairs in Emergencies | FEMA | OPA | |
| ICPO | (see INTERPOL) | ICE | |
| ICPS | Integrated Card Production System | USCIS | |
| ICR | Information Collection Request | FEMA | |
| ICRC | International Committee of the Red Cross | FEMA | |
| ICRI | Incident Commander Radio Interface | FEMA | |
| ICRP | International Commission on Radiological Protection | FEMA | S&T | CWMD | |
| ICS | Incident Command System | FEMA | |
| ICS | Initial Contingency Staff | FEMA | |
| ICSA | ICS Advisor | FEMA | |
| ICSC | International Cargo Security Council | CBP | |
| ICSCI | Incident Command for Structural Collapse Incidents | FEMA | |
| ICSSC | Interagency Committee on Seismic Safety in Construction | FEMA | |
| ICT | Incident Command Team | FEMA | |
| ICT1 | Incident Commander Type 1 | FEMA | |
| ICT2 | Incident Commander Type 2 | FEMA | |
| ICT3 | Incident Commander Type 3 | FEMA | |
| ICT4 | Incident Commander Type 4 | FEMA | |
| ICT5 | Incident Commander Type 5 | FEMA | |
| ICTAP | Interoperable Communications Technical Assistance Program | FEMA | |
| ICTOA | International Counter-Terrorism Officers Association | FEMA | |
| ICU | Incident Crisis Unit | FEMA | |
| ICU | Information Coordination Unit | FEMA | |
| ICU | Intensive Care Unit | FEMA | |
| ICWW | Intracoastal Waterway | FEMA | |
| ID | Identification credentials | CBP | TSA | |
| ID | Infectious Disease | FEMA | CISA | S&T | CWMD | |
| IDE | Initial Damage Estimate | FEMA | |
| IDE | Intrusion Detection Equipment [see IDS] | MGMT | |
| IDEC | International Drug Enforcement Conference | ICE | |
| IDEM | Iowa Department of Emergency Management | FEMA | |
| IDENT | Automated Biometric Identification System | CBP | CISA | I&A | PLCY | PRIV | |
| IDEX | Image Data Exploitation (System) | FEMA | |
| IDGA | Institute for Defense and Government Advancement | TSA | |
| IDIQ | Indefinite Delivery, Indefinite Quantity | FEMA | |
| IDLH | Immediate Danger to Life and/or Health | FEMA | |
| IDP | Imagery-Derived Product | FEMA | |
| IDPP | Infectious Disease Prevention Program | FEMA | |
| IDR | Institute for Disaster Research | FEMA | |
| IDS | Integrated Deepwater System | USCG | |
| IDS | Information Display System | FEMA | |
| IDS | Institute for Discrete Sciences | FEMA | |
| IDS | International District Station | FEMA | |
| IDS | Intrusion Detection System | TSA | I&A | |
| ID-WSF | Identity Web Services Framework | FEMA | |
| IE | Initial Elevation (Line) | FEMA | |
| IEA | Immigration Enforcement Agent | ICE | |
| IEA | International Energy Agency | FEMA | |
| IEC | Integrated Exploitation Capability | FEMA | |
| IEC | InterExchange Carrier | FEMA | |
| IECGP | Interoperable Emergency Communications Grant Program | FEMA | |
| IED | Incendiary Explosive Device | TSA | |
| IED | In-line Explosive Detection | TSA | |
| IED | Improvised Explosive Device | TSA | CISA | S&T | |
| IEEE | Institute of Electrical and Electronics Engineers | S&T | |
| IEISS | Interdependent Energy Infrastructure Simulation System | CISA | |
| IEMA | Illinois Emergency Management Agency | FEMA | |
| IEMC | Integrated Emergency Management Course | FEMA | |
| IEMG | International Emergency Management Group | FEMA | |
| IEMIS | Integrated Emergency Management Information System | FEMA | |
| IEMS | Integrated Emergency Management System | FEMA | |
| IEP | Ingestion Exposure Pathway | FEMA | |
| IEPD | Information Exchange Package Documentation | FEMA | |
| IES | Industry Executive Subcommittee | FEMA | |
| IETF | Internet Engineering Task Force | FEMA | |
| IETM | Interactive Electronic Technical Manual | FEMA | |
| IEVS | Income Eligibility Verification System | FEMA | |
| IF | Inland Fetch (Line) | FEMA | |
| IFALPA | International Federation of Airline Pilots Association | TSA | |
| IFB | Invitation for Bid | FEMA | |
| IFC | Intelligence Fusion Cell | FEMA | |
| IFC | internal fund code | MGMT | |
| IFC | internal fund code [financial] | MGMT | |
| IFE | In-flight Emergency | FEMA | |
| IFERWG | Industrial Fire & Emergency Response Working Group | FEMA | |
| IFERWG | International Fire & Emergency Response Working Group | FEMA | |
| IFG | Individual and Family Grant | FEMA | |
| IFGP | Individual and Family Grant Program | FEMA | |
| IFLOWS | Integrated Flood Observing and Warning System | FEMA | |
| IFMA | International Fire Marshals Association (formerly FMANA) | FEMA | |
| IFMIS | Integrated Financial Management Information System | FEMA | MGMT | |
| IFPA | Institute for Foreign Policy Analysis, Inc. | CBP | USCG | |
| IFR | Interim Final Rule | OGC | |
| IFR | Instrument Flight Rules | FEMA | |
| IFSAC | International Fire Service Accreditation Congress | FEMA | |
| IFSAR | Interferometric Synthetic Aperture Radar | FEMA | |
| IFSP | Integrated Federal Support Plan | OPS | |
| IFSTA | International Fire Service Training Association | FEMA | |
| IFTP | Internet Forensic Training Program | FLETC | |
| IG | Inspector General (see also OIG) | FEMA | OGC | |
| IG | Instructor Guide | FEMA | |
| IGA | Intergovernmental Affairs | DHS | |
| IGCE | independent government cost estimate | S&T | |
| IGD | Infrastructure and Geophysical Division (S&T/IGD) | DHS | |
| IGE | Independent Government Estimate | FEMA | |
| IGES | Initial Graphics Exchange Specification | FEMA | |
| IGP | Intergovernmental Programs, Office of (NPPD/IGP) | DHS | |
| IGPT | Interagency Geospatial Preparedness Team | FEMA | |
| IGRP | Interior Gateway Routing Protocol | FEMA | |
| IGSA | Inter-Governmental Service Agreement | FEMA | |
| IH | Industrial Hygiene | FEMA | |
| IH | Industrial Hygienist | FEMA | |
| IH | Inhalation | FEMA | |
| IH | Intense Hurricane | FEMA | |
| IHC | Interagency Hotshot Crew | FEMA | |
| IHC | International Hurricane Center | FEMA | |
| IHD | Intense Hurricane Day | FEMA | |
| IHE | Insensitive High Explosive | FEMA | |
| IHMT | Interagency Hazard Mitigation Team | FEMA | |
| IHOG | Interagency Helicopter Operation Guide | FEMA | |
| IHP | Individual and Households Program | FEMA | |
| IHS | Indian Health Service | FEMA | |
| IHSS | Institute for Homeland Security Solutions | S&T | |
| IIBMH | Interagency Incident Business Management Handbook | FEMA | |
| IIC | Interagency Intelligence Cell | FEMA | |
| IIC | Investigator in Charge | FEMA | |
| IICRC | Institute of Inspection Cleaning and Restoration Certification | FEMA | |
| IICT | Interagency Intelligence Committee on Terrorism | CISA | I&A | |
| IIFC | Information/Intelligence Fusion Center | FEMA | |
| III | Interstate Identification Index | TSA | |
| IIMG | Interagency Incident Management Group | FEMA | CISA | |
| IIMS | Integrated Information Management System | FEMA | |
| IIMT | Interagency Incident Management Team | FEMA | |
| IIOM | Install, Integrate, Operate, and Maintain | FEMA | |
| IIPLR | Insurance Institute for Property Loss Reduction | FEMA | |
| IIPO | Information Integration Program Office | FEMA | |
| IIRIRA | Illegal Immigration Reform and Immigrant Responsibility Act | USCIS | OGC | |
| IIT | Incident Investigation Team | FEMA | |
| IITCT | Interviewing and Interrogation Techniques for Courtroom Testimony | FEMA | |
| IITP | Internet Investigations Training Program | FLETC | |
| IJIS | Integrated Justice Information System | FEMA | |
| ILE | Installations, Logistics & Environment | FEMA | |
| ILEA | International Law Enforcement Academy | FLETC | |
| ILL | interlibrary loan | DHS | |
| ILM | Information Lifecycle Management | FEMA | |
| ILS | Integrated Logistics Support | CBP | |
| ILT | instructor-led training | MGMT | |
| IM | Incident Management (Task) | FEMA | |
| IMA | Individual Mobilization Augmentee | FEMA | |
| IMAAC | Interagency Modeling and Atmospheric Assessment Center | CISA | S&T | |
| IMAC | Infrastructure Monitoring, Analysis, and Coordination | CISA | |
| IMAGE | ICE Mutual Agreement Between Government and Employers | ICE | |
| IMAP | Interactive Mail Access Protocol | FEMA | |
| IMAR | Inspection Management Activity Report | FEMA | |
| IMAT | Incident Management Assist Team | FEMA | |
| IMC | Instrument Meteorological Conditions | FEMA | |
| IMC | Interim Message Change | FEMA | |
| IMC | International Mechanical Code | FEMA | |
| IMC | International Medical Corps | FEMA | |
| IMCS | Incident Management Communications Systems | FEMA | |
| IMD | Incident Management Division | FEMA | |
| IMET | Incident Meteorologist | FEMA | |
| IMG | Information Management Group | FEMA | |
| IMINT | Imagery Intelligence | FEMA | |
| IMO | International Maritime Organization | TSA | USCG | |
| IMOC | International Maritime Officers Course | FEMA | |
| IMPAC | International Merchant Purchase Authorization Card | FEMA | |
| IMPT | Incident Management Planning Team | OPS | |
| IMRD | Information Management and Requirements Division | I&A | |
| IMS | Incident Management System | I&A | |
| IMS | Image Management System | FEMA | |
| IMS | Information Management System | FEMA | |
| IMS | Institute of Museum Services | FEMA | |
| IMS | Intelligence Management System | FEMA | |
| IMS | Ion Mobility Spectrometry | FEMA | |
| IMSA | Incident Medical Special Assistant | FEMA | |
| IMSD | Incident Management Systems Division [of DHS/FEMA] (see IMSI or IMSID) | FEMA | |
| IMSI | Incident Management Systems Integration Division [of DHS/FEMA] | FEMA | |
| IMSID | Incident Management Systems Integration Division | FEMA | |
| IMSM | Incident Medical Special Manager | FEMA | |
| IMSR | Incident Management Situation Report | FEMA | |
| IMST | Incident Medical Special Technician | FEMA | |
| IMSuRT | International Medical Surgical Response Team | FEMA | |
| IMT | Incident Management Team | USCG | |
| IMT | Integrated Management Team | FEMA | |
| IMU | Inertial Measurement Unit | FEMA | |
| INA | Immigration and Nationality Act | USCIS | I&A | |
| INC | Income | FEMA | |
| INCITS | International Committee for Information Technology Standards | I&A | MGMT | |
| INCM | Incident Communications Manager | FEMA | |
| IND | Improvised Nuclear Device | CISA | S&T | CWMD | |
| IND | International Programs Division (S&T/IND) | DHS | |
| INEEL | Idaho National Engineering and Environmental Laboratory | FEMA | |
| INEOA | International Narcotic Enforcement Officers Association | FEMA | |
| INER | Interagency National Executive Reserve | FEMA | |
| INES | International Nuclear Event Scale | FEMA | |
| INF | Immediate Needs Funding | FEMA | |
| INF | Infrastructure | FEMA | |
| INFOCON | Information Operations Condition | FEMA | |
| INFOSEC | Information Security | I&A | |
| INL | International Narcotics and Law Enforcement Affairs [Bureau for] | DHS | |
| INMARST | International Maritime Satellite Terminal | FEMA | |
| INPASS | INS Passenger Accelerated Service System | CBP | CISA | |
| INPHO | Information Network for Public Health Officials | FEMA | |
| INPO | Institute for Nuclear Power Operations | FEMA | |
| INRP | Initial National Response Plan | FEMA | |
| INS | Immigration and Naturalization Service (replaced among USCIS, CBP and ICE at DHS; see also DMIATF and ASUFAC) | FEMA | |
| INS | Incident of National Significance (see IONS or CINS) | FEMA | |
| INS | Inertial Navigation System | FEMA | |
| INS | Insurance | FEMA | |
| INSARAG | International Search and Rescue Advisory Group | FEMA | |
| Insp | Inspection | FEMA | |
| INSPASS | see INPASS | CBP | CISA | |
| INT | Intelligence, Office of (ICE/INT) | DHS | |
| INTERCOM | Internal Communications | FEMA | |
| INTERPOL | International Criminal Police Organization | ICE | |
| INV | Investigations, Office of (ICE/INV), (USSS/INV) | DHS | |
| INVEST | Investment, Evaluation, Submission and Tracking System (*) | MGMT | |
| IO | Information Officer | FEMA | |
| IOC | Initial Operational Capability | FEMA | |
| IOC | International Olympic Committee | FEMA | |
| IOF | Initial Operating Facility | FEMA | |
| IOF | Interim Operating Facility | FEMA | |
| IOM | International Organization for Migration | FLETC | |
| IONS | Incident of National Significance | FEMA | |
| IOR | Initial Operating Report | FEMA | |
| IOS | see ISO | FEMA | |
| IP | Implementing Procedure | FEMA | |
| IP | Improvement Plan | FEMA | |
| IP | Infected Premises | FEMA | |
| IP | Information and Planning | FEMA | |
| IP | Infrastructure Protection, Office of (NPPD/IP) [formerly with IAIP] | DHS | |
| IP | Internet Protocol | FEMA | |
| IP | intellectual property | S&T | |
| IPA | Interagency Personnel Agreement | FEMA | |
| IPAWS | Integrated Public Alert and Warning System | FEMA | |
| IPB | Illustrated Parts Breakdown | FEMA | |
| IPC | Initial Planning Conference | FEMA | |
| IPC | Interagency Planning Committee | FEMA | |
| IPC | International Paralympic Committee | FEMA | |
| IPD | Infrastructure Protection Division | FEMA | |
| IPE | Integrated Performance Evaluation | FEMA | |
| IPE | Integrated Process Evaluation | FEMA | |
| IPFO | Interim Principle Federal Official | FEMA | |
| IPG | Integrated Planning Guidance | FEMA | |
| IPIA | Improper Payments Information Act | FEMA | |
| IPP | Imminent Peril to the Public | FEMA | |
| IPP | Infrastructure Protection Program | FEMA | |
| IPR | Incident Prevention and Response [Task] (National Preparedness Guidance) | FEMA | |
| IPR | Initial Projections Report | FEMA | |
| IPR | In-Process Review | FEMA | |
| IPR | In-Progress Review | FEMA | |
| IPR | Intellectual Property Rights | FEMA | |
| IPRL | Intelligent Personal Radiation Locator | CWMD | |
| IPRSGP | Intercity Passenger Rail Security Grant Program | FEMA | |
| IPS | International Port Security | USCG | |
| IPS | Information and Planning Section | FEMA | |
| IPS | Information Processing System | FEMA | |
| IPS | Integrated Planning System | FEMA | |
| IPSCOM | Imagery Policy and Security Committee | FEMA | |
| IPT | Integrated Project Team | MGMT | |
| IPT | integrated product/project team | MGMT | |
| IPT | Integrated Product Team | S&T | |
| IPT | Integrated Process Team | FEMA | |
| IPTI | Integrated Patient Tracking Initiative | FEMA | |
| IPX | Internetwork Packet Exchange | FEMA | |
| IPZ | Ingestion Pathway Zone | FEMA | |
| IQ | Internet Quorum | DHS | |
| IR | Infrared | FEMA | |
| IR | Infrared Radiation | FEMA | |
| IRA | Immediate Response Authority | FEMA | |
| IRAC | Interagency Radiological Assistance Committee | FEMA | |
| IRAPP | Infrastructure Risk Assessment Partnership Program | CISA | |
| IRB | Information Resources Board | FEMA | |
| IRB | Institutional Review Board (MD 10300) | FEMA | |
| IRB | Investment Review Board | FEMA | |
| IRBM | Intermediate Range Ballistic Missile | FEMA | |
| IRC | Information Resources Center | FEMA | |
| IRC | InfoSec (Information Security) Research Council | FEMA | |
| IRC | International Residential Code | FEMA | |
| IRCA | Immigration Reform and Control Act (1986) | CISA | OGC | |
| IRCM | Infrared Countermeasure | S&T | |
| IRF | Initial Response Force | FEMA | |
| IRFA | International Religious Freedom Act | FEMA | |
| IRFC | Initial Response Force Commander | FEMA | |
| IRFS | Infrared Field Specialist | FEMA | |
| IRI | Industrial Research Institute | S&T | |
| IRIN | Infrared Interpreter | FEMA | |
| IRIS | Incident Resource Inventory System | FEMA | |
| IRIS | Incorporated Research Institutions for Seismology | FEMA | |
| IRM | Information Resources Management | FEMA | |
| IRMCO | Interagency Resources Management Conference | FEMA | |
| IRMS | Information Resources Management Service | FEMA | |
| IRP | Institutional Removal Program | ICE | |
| IRP | Installation Restoration Plan | FEMA | |
| IRP | Investment Review Process | FEMA | |
| IRP | Interior Repatriation Program | CBP | ICE | |
| IRPMR | Information Resources Procurement and Management Review | FEMA | |
| IRR | Initial Response Resource(s) | FEMA | |
| IRRIS | Integrated Response and Recovery Information System | FEMA | |
| IRS | Internal Revenue Service | DHS | |
| IRT | Independent Review Team | FEMA | |
| IRT | Initial Response Team | FEMA | |
| IRT | International Registered Traveler | I&A | PLCY | PRIV | |
| IRTI | Immigration Reform Transformation Initiatives | USCIS | PLCY | |
| IRTPA | Intelligence Reform and Terrorism Prevention Act (2004) | CBP | CRCL | I&A | OGC | |
| IRVMC | Inland River Vessel Management Center | USCG | |
| IRZ | Immediate Response Zone | FEMA | |
| IS | Independent Study | FEMA | |
| IS | Information Security | FEMA | |
| IS | Information System | FEMA | |
| IS | Infrastructure Support | FEMA | |
| IS | Inspection Services | FEMA | |
| IS&C | Information Sharing and Coordination [Branch] (Office of Intelligence & Analysis) | FEMA | |
| ISA | Incident Staging Area | FEMA | |
| ISAA | information sharing and access agreement | MGMT | PRIV | |
| ISAAC | Integrated Securityand Access Control | FEMA | |
| ISAAG | Information Systems Architectural Advisory Group | FEMA | |
| ISABP | International South Atlantic Buoy Program | FEMA | |
| ISAC | Information Sharing and Analysis Center | I&A | |
| ISAC | Infrastructure Sector Advisory Committee | FEMA | |
| ISACA | Information Systems Audit and Control Association | MGMT | |
| ISAMS | Information Sharing Agreement Management System | I&A | |
| ISAO | Information Sharing and Analysis Organization | I&A | |
| ISAR | Inspection Services Activity Report | FEMA | |
| ISBE | Infrastructure Security for the Built Environment | FEMA | |
| ISC | Interagency Security Committee | MGMT | |
| ISC | Information Sharing & Collaboration Office (I&A/ISC) | DHS | |
| ISC | Infrastructure Subcommittee | FEMA | |
| ISC | Inspection Services Coordinator | FEMA | |
| ISC | Interstate Commerce | FEMA | |
| ISCC | Information Sharing Coordinating Council | I&A | |
| ISCO | Information Sharing and Collaboration Office | FEMA | |
| ISCORS | Interagency Steering Committee on Radiation Standards | FEMA | |
| ISCP | Integrated Support Communications Plan | FEMA | |
| ISCS | International Satellite Communications Systems | FEMA | |
| ISD | Infrastructure Services Division | FEMA | |
| ISDL | Inert Skin Decontamination Lotion | FEMA | |
| ISDN | Integrated Services Digital Network | I&A | MGMT | |
| ISDR | International Strategy for Disaster Reduction | FEMA | |
| ISE | Information Sharing Environment | I&A | |
| ISEMA | Indiana State Emergency Management Agency | FEMA | |
| ISFSI | International Society of Fire Service Instructors | FEMA | |
| ISG | Incident Support Group | FEMA | |
| ISGB | Information Sharing Governance Board | FEMA | |
| ISI | Immigration Security Initiative | USCIS | |
| ISIP | Initial Strategy Implementation Plan | FEMA | |
| ISIS | Integrated Surveillance Intelligence System | CBP | |
| ISM | Information Security Marketing | FEMA | |
| ISM | Integrated Safety Management | FEMA | |
| ISMA | International Security Management Association | PLCY | |
| ISMS | integrated security managements systems | MGMT | |
| ISO | Incident Support Organization | FEMA | |
| ISO | Insurance Services Office | FEMA | |
| ISO | International Security Organization | FEMA | |
| ISO | International Organization for Standardization | S&T | I&A | |
| ISOC | Information Security Oversight Committee | FEMA | |
| ISOC | Interagency SEAT Operations Guide | FEMA | |
| ISOO | Information Security Oversight Office | MGMT | |
| ISP | Interagency Security Plan | CISA | |
| ISP | Internet Service Provider | USSS | |
| ISP | Intensive Supervision Program | ICE | |
| ISP | Immediate Services Program | FEMA | |
| ISP | Information Systems Plan | FEMA | |
| ISP | Information Security Program | MGMT | |
| ISPAG | Information Systems Policy Advisory Group | FEMA | |
| ISPP | Information Systems Planning Program | FEMA | |
| ISPS | International Ship and Port Facility Security | USCG | |
| ISR | Intelligence, Surveillance and Reconnaissance | USCG | |
| ISRS | Image Storage and Retrieval System | CBP | ICE | USCIS | CISA | |
| ISSA | Information Systems Security Association | USSS | |
| ISSA | Interservice Support Agreement | FEMA | |
| ISSGB | DHS Information Sharing and Safeguarding Governance Board | MGMT | |
| ISSGB | Information Sharing and Safeguarding Governance Board | I&A | |
| ISSM | Information System Security Manager | MGMT | |
| ISSO | Information System Security Officer | MGMT | |
| ISSP | Information Systems Security Program | FEMA | |
| IST | Incident Support Team | FEMA | |
| IST-A | Incident Support Team – Advance Element | FEMA | |
| I-STAFF | DHS Headquarters Operational Integration Staff (folded into new Directorate for Preparedness Oct 2005) | FEMA | |
| ISTEA | Intermodal Surface Transportation Efficiency Act | FEMA | |
| ISTL | Incident Support Team Leader | FEMA | |
| ISTS | Institute for Security Technology Studies | CISA | S&T | |
| ISVB | Imagery Science Validation Board | FEMA | |
| ISWG | Import Safety Working Group | PLCY | |
| IT | Information Technology | DHS | |
| ITA | Integrated Transport Analysis | TSA | |
| ITA | Information Technology Architecture | FEMA | |
| ITAA | Information Technology Association of America | PRIV | |
| ITAC | Information Technology Acquisition Center | MGMT | |
| ITACG | Interagency Threat Assessment and Coordination Group | FEMA | |
| ITAR | Information Technology Acquisition Review | MGMT | |
| ITAR | International Traffic in Arms Regulations | CBP | S&T | |
| ITC | Information Technology Committee | FEMA | |
| ITC | Information Technology Coordinator | FEMA | |
| ITC | International Trade Commission | CBP | FEMA | |
| ITD | information technology dashboard (*) | MGMT | |
| ITD | International Training Division | USCG | |
| ITDS | International Trade Data System | CBP | I&A | |
| ITE | Institute of Transportation Engineers | FEMA | |
| I-Team | Incident Team | FEMA | |
| I-Team | Intelligence Team | FEMA | |
| ITED | IFSAR Terrain Elevation Data | FEMA | |
| ITEP | Information Technology & Evaluation Program | FEMA | |
| ITF | Intelligence Task Force | FEMA | |
| ITI | International to International | CBP | TSA | |
| ITIPS | Information Technology Investment Portfolio System | I&A | MGMT | |
| ITL | Information Technology Laboratory | FEMA | |
| ITM | Inspection Transfer Manager | FEMA | |
| ITMRA | Information Technology Management Reform Act | I&A | |
| ITOC | Insider Threat Operations Center | I&A | |
| ITP | Infrastructure Transformation Program | MGMT | |
| ITP | Individual Training Plan | FEMA | |
| ITPM | Insider Threat Program Manager | I&A | |
| ITPMO | Infrastructure Transformation Program Office | MGMT | |
| I-TRAP | Interagency Terrorism Response Awareness Program | FEMA | |
| ITS | Information Technology Services | FEMA | |
| ITS | Intelligent Transportation System | FEMA | |
| ITSD | Information Technology Services Directorate | FEMA | |
| ITSH | Internal Transport, Storage, and Handling | FEMA | |
| ITSO | Information Technology Services Office | MGMT | |
| ITTC | Identity Theft Technology Council | S&T | |
| ITU | International Telegraphic Union | FEMA | |
| ITV | In-Transit Visibility | FEMA | |
| ITWG | International Technical Working Group | S&T | |
| IUPA | International Union of Police Associations | FEMA | |
| IV | Intravenous | FEMA | |
| IV&V | Interdependent Verification and Validation | TSA | CISA | |
| IVD | Interactive Video Disk | FEMA | |
| IVHHN | International Volcanic Health Hazard Network | FEMA | |
| IVR | Interactive Voice Response | FEMA | |
| IWG | Implementation Working Group | ICE | |
| IWG | Investment Working Group | FEMA | |
| IWIN | Interactive Weather Information Network | FEMA | |
| IWN | Integrated Wireless Network | MGMT | |
| IWOMEN | Women in the Fire Services, Inc. (former WFS) | FEMA | |
| IWP | Integrated Warning Program | FEMA | |
| IWS | Information Warfare and Strategy | FEMA | |
| JAARS | Joint After-Action Reporting System | FEMA | |
| JAC | Joint Advisory Committee | FEMA | |
| JAC | Joint Analysis Center | CWMD | I&A | |
| JACADS | Johnston Atoll Chemical Agent Disposal System | FEMA | |
| JACE | Joint Assessment of Catastrophic Events | FEMA | |
| JAD | Joint Application Development | FEMA | |
| JAG | Joint Action Group | FEMA | |
| JAG | Judge Advocate General (DOD) | FEMA | |
| JANAP | Joint Army-Navy-Air Force Publication | FEMA | |
| JAS | Joint Alternate Site | FEMA | |
| JATS | Joint Air Transportation System | FEMA | |
| JAWAS | Joint Automated Weather Observing System | FEMA | |
| JBPDS | Joint Biological Point Detection Systems | FEMA | |
| JCAH | Joint Commission on Accreditation of Hospitals | FEMA | |
| JCAHO | Joint Commission on Accreditation of Healthcare Organizations | FEMA | |
| JCC | Joint Coordination Center | FEMA | |
| JCCC | Joint Customs Coordination Council [United States and European Union] | CBP | |
| JCGC | Joint Center for Global Connectivity | CWMD | |
| JCS | Joint Chiefs of Staff | DHS | |
| JDCC | Joint Data Coordination Center | FEMA | |
| JDISS | Joint Deployable Intelligence Support System | FEMA | |
| JDOMS | Joint Director of Military Support | FEMA | |
| JEAD | Joint Exercise and Analysis Division (Joint Staff - J-7) | FEMA | |
| JECG | Joint Exercise Control Group | FEMA | |
| JEEP | Joint Emergency Evacuation Plan | FEMA | |
| JEMP | Joint Exercise Management Program | FEMA | |
| JEOC | Joint Emergency Operations Center | FEMA | |
| JFACC | Joint Force Air Component Commander | FEMA | |
| JFC | Joint Force Commander | FEMA | |
| JFCOM | Joint Forces Command | FEMA | |
| JFHQ-HLS | Joint Forces Headquarters - Homeland Security | FEMA | |
| JFHQ-State | Joint Force Headquarters-State | FEMA | |
| JFLCC | Joint Force Land Component Commander | FEMA | |
| JFMCC | Joint Force Maritime Component Commander | PLCY | |
| JFO | Joint Field Office | FEMA | |
| JFOCG | Joint Field Office Coordination Group | FEMA | |
| JFSP | Joint Fire Science Program | FEMA | |
| JHA | Job Hazard Analysis | FEMA | |
| JHAT | Joint Hazardous Assessment Team | FEMA | |
| JHEC | Joint Hazard Evaluation Center | FEMA | |
| JHOC | Joint Harbor Operations Command Center | USCG | |
| JHOC | Joint Harbor Operations Center | PLCY | |
| JI | Johnston Island | FEMA | |
| JIACG | Joint Interagency Coordination Group | FEMA | |
| JIALO | Joint Interagency Liaison Officer | FEMA | |
| JIATF | Joint Interagency Task Force | ICE | TSA | |
| JIATF-S | Joint Interagency Task Force - South | ICE | TSA | |
| JIB | Joint Information Bureau | FEMA | |
| JIC | Joint ICE Center | FEMA | |
| JIC | Joint Information Center | FEMA | |
| JIC | Joint Intelligence Center | FEMA | |
| JICG | Joint International Control Group | FEMA | |
| JICPAC | Joint Intelligence Center, Pacific | FEMA | |
| JIISE | Joint Interagency Intelligence Support Element | FEMA | |
| JIMPP | Joint Industrial Mobilization Planning Process | FEMA | |
| JIOC | Joint Investigative Operations Center | USCG | |
| JIS | Joint Information System | FEMA | |
| JIT | Job Instruction Training | FEMA | |
| JIT | Just In Time | FEMA | |
| JITC | Joint Interoperability Test Command | FEMA | |
| JITF-CT | Joint intelligence Task Force for Combating Terrorism | FEMA | |
| JITT | just-in-time training | MGMT | |
| JLCO | Joint Legal Claims Office | FEMA | |
| JMC | Joint Movement Center | FEMA | |
| JMET | Joint Mission Essential Task | FEMA | |
| JMFU | Joint METOC Forecast Unit | FEMA | |
| JMIE | Joint Maritime Information Element | I&A | PLCY | PRIV | |
| JMIP | Joint Military Intelligence Program | I&A | |
| JMMO | Joint Medical Mobilization Office | FEMA | |
| JMRO | Joint Medical Regulating Office | FEMA | |
| JMT | Joint Management Team (combination of IST and MST - US&R and DMAT or NDMS) | FEMA | |
| JNACC | Joint Nuclear Accident Coordinating Center | FEMA | |
| JNAIRT | Joint Nuclear Accident/Incident Response Team | FEMA | |
| JNC | Joint News Center | FEMA | |
| JOA | Joint Operational Area | FEMA | |
| JOC | Joint Operations Center | FEMA | |
| JOPES | Joint Operations Planning and Execution System | FEMA | |
| JPAC | Joint Planning Augmentation Cell (for CBIRF) | FEMA | |
| JPAS | Joint Personnel Adjudication System | FEMA | |
| JPATS | Justice Prisoner and Alien Transportation System | ICE | |
| JPEG | Joint Photographic Experts Group | FEMA | |
| JPEO/CBD | Joint Program Executive Office for Chemical and Biological Defense | CISA | |
| JPIC | Joint Public Information Center | FEMA | |
| JPMRC | Joint Patient Movement Requirements Center | FEMA | |
| JPMT | Joint Patient Movement Team | FEMA | |
| JPO | Joint Program Office | FEMA | |
| JPSG | Justice-Defense Program Steering Group | FEMA | |
| JRC | Joint Requirements Council | FEMA | |
| JRCT | Joint Requirements Coordination Team | MGMT | |
| JRERP | Joint Radiological Emergency Response Plan | FEMA | |
| JRIC | Joint Regional Intelligence Center | FEMA | |
| JRIES | JITF-CT RISSNET Information Exchange System | FEMA | |
| JRIES | Joint Regional Information Exchange System | CISA | I&A | OPS | |
| JRMP | Joint Regional Medical Planner | FEMA | |
| JRMPO | Joint Regional Medical Planning Office | FEMA | |
| JRS | Joint Reporting System | FEMA | |
| JRT | Joint Response Team | FEMA | |
| JS | Joint Staff | FEMA | |
| JSCP | Joint Strategic Capabilities Plan | FEMA | |
| JSERA | Joint Special Events Risk Assessment | CISA | |
| JSIPP | Joint Service Installation Pilot Program | FEMA | |
| JSOTF | Joint Special Operations Task Force | FEMA | |
| JSTARS | Joint Surveillance Target Attack Radar System | FEMA | |
| JTA | Jacksonville Transportation Authority | FEMA | |
| JTF | Joint Task Force | FEMA | |
| JTF - O | Joint Task Force - Olympics | FEMA | |
| JTF-CM | Joint Task Force - Consequence Management | FEMA | |
| JTF-CS | Joint Task Force - Civil Support | FEMA | |
| JTF-FF | Joint Task Force - Firefighter | FEMA | |
| JTF-Katrina | Joint Task Force-Katrina | FEMA | |
| JTF-NCR | Joint Task Force - National Capital Region | FEMA | |
| JTF-State | Joint Task Force-State | FEMA | |
| JTIMS | Joint Training Information Management System | FEMA | |
| JTMS | Joint Training Master Schedule | FEMA | |
| JTOT | Joint Tactical Operations Team | FEMA | |
| JTOT | Joint Technical Operations Team | FEMA | |
| JTPA | Job Training Partnership Act | FEMA | |
| JTR | Joint Travel Regulations | FEMA | |
| JTRB | Joint Telecommunications Resources Board | FEMA | |
| JTTF | Joint Terrorism Task Force | FEMA | I&A | |
| JTWC | Joint Typhoon Warning Center | FEMA | |
| JULL | Joint Universal Lessons Learned (Report) | FEMA | |
| JULLS | Joint Universal Lessons Learned System | FEMA | |
| JVM | Java Virtual Machine | FEMA | |
| JWARN | Joint Warning and Reporting Network | FEMA | |
| JWC | Joint Warfare Center | FEMA | |
| JWFC | Joint Warfighting Center | FEMA | |
| JWICS | Joint Worldwide Intelligence Communication System | FEMA | I&A | |
| JWID | Joint Warrior Interoperability Demonstration | FEMA | |
| JXDM | [Global] Justice XML Data Model | I&A | |
| k | kilo (1,000) | FEMA | |
| KAPP | Key Asset Protection Program (see CAAP) | FEMA | |
| Kb | Kilobit | FEMA | |
| kB | Kilobyte | FEMA | |
| kBPS | Kilobits Per Seconds | FEMA | |
| KBRM | Knowledge-Based Risk Management | CBP | |
| KCCO | Kansas City Commodity Office | FEMA | |
| KD | Knocked Down | FEMA | |
| KDEM | Kansas Department of Emergency Management | FEMA | |
| KDEM | Kentucky Department of Emergency Management | FEMA | |
| KDP | Key Decision Point | FEMA | |
| KEDB | known error database | MGMT | |
| kg | kilogram | FEMA | |
| kHz | kiloHertz | FEMA | |
| KI | Potassium Iodide | FEMA | S&T | |
| KIO | Key Intelligence Official | I&A | |
| km | kilometer | FEMA | |
| KMI | Key Management Infrastructure | FEMA | |
| KML | Keyhole Markup Language | FEMA | |
| KMS | Knowledge Management System | FEMA | |
| kN | kilo-Newton | FEMA | |
| KPI | key performance indicator | MGMT | |
| KPP | key performance parameter | S&T | |
| KR | key resource | DHS | |
| KSA | Knowledge, Skills, and Abilities | FEMA | |
| KSO | Key Security Official (MD 10300) | FEMA | |
| KST | Known or Suspected Terrorist | FEMA | |
| KT | Kiloton | FEMA | |
| kV | kilovolt | FEMA | |
| KVERT | Kamchatkan Volcanic Eruptions Response Team | FEMA | |
| kW | Kilowatt | FEMA | |
| kWh | kilowatt hour | FEMA | |
| L | Locality | FEMA | |
| L&D | Learning & Development | FEMA | |
| LA | Legislative Affairs (see OLA) | FEMA | |
| LAC | Local Assistance Center | FEMA | |
| LAG | Lowest Adjacent Ground [grade] | FEMA | |
| LAN | Local Area Network | FEMA | I&A | MGMT | OPA | |
| LAN/WAN | Local Area Network/Wide Area Network | FEMA | |
| LANDSAT | Land Satellite | FEMA | |
| LANL | Los Alamos National Laboratory | CWMD | |
| LAO | Lead Agency Official | FEMA | |
| LAP | Lesson Administration Page | FEMA | |
| LASP | Large Aircraft Security Program | TSA | |
| lb | pound | FEMA | |
| LBAD | Lexington Blue Grass Army Depot | FEMA | |
| lbf | pound force | FEMA | |
| LBP | lead-based paint | DHS | |
| LC | Logistics Center | FEMA | |
| LC-A | Logistics Center-Atlanta | FEMA | |
| L-CAR | Local Capability Assessment for Readiness | FEMA | |
| LCAT | Logistics Closeout Assistance Team | FEMA | |
| LCCE | Life Cycle Cost Estimate | CISA | |
| LC-FW | Logistics Center-Fort Worth | FEMA | |
| LCM | Life Cycle Management | FEMA | |
| LC-MF | Logistics Center-Moffett Field | FEMA | |
| LCMS | Learning Content Management System | FEMA | |
| LCO | Limiting Condition for Operation | FEMA | |
| LCS | Local Communications System | FEMA | |
| LCT | Liaison Coordination Team | FEMA | |
| LD | Lethal Dose | FEMA | |
| LD | Limited Data | FEMA | |
| LDAP | Light Directory Access Protocol | FEMA | |
| LDM | logical data model | MGMT | |
| LDR | Lutheran Disaster Response | FEMA | |
| LDS | Lightning Detection System | FEMA | |
| LDW | Last Day Worked | FEMA | |
| LE | loaned executive | MGMT | |
| LE | law enforcement [activity] | DHS | |
| LE | Law Enforcement | FEMA | |
| LEA | Light Enforcement Aircraft | ICE | |
| LEA | Law Enforcement Agency | FEMA | FLETC | USCG | |
| LEADERS | Lightweight Epidemiology Advanced Detection and Emergency Response System | FEMA | |
| LEAINTP | Law Enforcement Advanced Interviewing Training Program | FLETC | |
| LEAP | Law Enforcement Availability Pay | ICE | |
| LEC | Local Exchange Carrier | FEMA | |
| LECC | Law Enforcement Coordination Center | FEMA | |
| LEDET | Law Enforcement Detachment | USCG | |
| LEED® | leadership in energy and environmental design | FLETC | |
| LeeTran | Lee County Transit Authority (Florida) | FEMA | |
| LEGAT | Legal Attache | FEMA | OGC | |
| LEH | Light Enforcement Helicopter | ICE | |
| LEISP | Law Enforcement Information Sharing Program | FEMA | |
| LEL | Lower Explosive Limit | FEMA | |
| LEL | Lowest Effect Level | FEMA | |
| LELI | Law Enforcement Leadership Institute | FLETC | |
| LEM | Local Emergency Management | FEMA | |
| LEMA | Local Emergency Management Authority | FEMA | |
| LEMDP | Law Enforcement Management Development Program | FLETC | |
| LEO | Law Enforcement Online | I&A | |
| LEO | Law Enforcement Officer | FLETC | TSA | |
| LEOC | Local Emergency Operations Center | FEMA | |
| LEOSA | Law Enforcement Officers Safety Act | CBP | FLETC | TSA | |
| LEP | Loaned Executive Program | MGMT | |
| LEP | limited English proficient person | CRCL | |
| LEP | Leadership Excellence Program | FEMA | |
| LEP | Limited English Proficiency | FEMA | CRCL | |
| LEPB | Loaned Executive Program Board | MGMT | |
| LEPC | Local Emergency Planning Committee | FEMA | |
| LEPPC | Local Emergency Prevention and Preparedness Council | FEMA | |
| LERN | Law Enforcement Radio Net | FEMA | |
| LERT | Logistics Emergency Response Team | FEMA | |
| LES | law enforcement sensitive | I&A | |
| LESC | Law Enforcement Support Center | ICE | |
| LESO | Law Enforcement Security Officer | FEMA | |
| LETPP | Law Enforcement Terrorism Prevention Program | CISA | |
| LETS | Law Enforcement Telecommunications System | FEMA | |
| LEU | Low-Enriched Uranium | FEMA | |
| LEVEL 1 EST | Full EST activation level (NRCC) | FEMA | |
| LEVEL 2 EST | Intermediate EST activation level (NRCC) | FEMA | |
| LEVEL 3 EST | Minimal EST activation level (NRCC) | FEMA | |
| LEWG | Law Enforcement Working Group | FEMA | |
| LF | Linear Foot | FEMA | |
| LF | Low Frequency | FEMA | |
| LFA | Lead Federal Agency | FEMA | |
| LFD | Letter of Final Determination | FEMA | |
| LFE | Lowest Floor Elevation | FEMA | |
| LFEOC | Local Federal Emergency Operations Center | FEMA | |
| LFFE | Lowest Finished Flood Elevation | FEMA | |
| LFO | Lead Federal Official | FEMA | |
| LFP | Livestock Feed Programs | FEMA | |
| LH | Local Hire | FEMA | |
| LHA/LHD | Landing Helicopter - Assault/ Landing Helicopter - Deck | FEMA | |
| LHD | Local Health Department | FEMA | CISA | CWMD | |
| LHMC | Local Hazard Mitigation Coordinator | FEMA | |
| LHR | Limited Home Repair | FEMA | |
| LHW | Last Hour Worked | FEMA | |
| LIBSYS | Library System | FEMA | |
| LIC | License | FEMA | |
| LID | Low-Impact Development | FEMA | |
| LIDAR | Light Detection and Ranging (system) | FEMA | |
| LIDEF | Levee Inventory Data Entry Form | FEMA | |
| LIFE | Legal Immigration Family Equity | USCIS | |
| LIHEAP | Low Income Household Energy Assistance Program | FEMA | |
| LIMFAC | Limiting Factor | FEMA | |
| LIMS | Logistics Information Management System | USCG | |
| LIMS | Laboratory Information Management System | FEMA | |
| LINX | Law Enforcement Information Exchange [Navy] | I&A | |
| LISS | Linear Imaging and Self-Scanning | FEMA | |
| LL | Lessons Learned | FEMA | |
| LLEA | Lead Law Enforcement Agency | FEMA | |
| LLEA | Local Law Enforcement Agency | FEMA | FLETC | CISA | |
| LLIS | Lessons Learned Information Sharing System | PLCY | |
| LLNL | Lawrence Livermore Laboratory | S&T | CWMD | |
| LLP | Limited Liability Partnership | DHS | |
| LLR | Lessons Learned (Hot Wash) Report | FEMA | |
| LLW | Low-Level Waste | FEMA | |
| LLWS | Low-Level Wind Shear | FEMA | |
| LM | Logistics Management (FEMA/LM) | DHS | |
| LMA | Land Management Agencies | FEMA | |
| LMD | Logistics Management Directorate (of DHS/FEMA) | FEMA | |
| LMF | Logistics Management Facility | FEMA | |
| LMFBR | Liquid Metal Fast Breeder Reactor | FEMA | |
| LMI | Logistics Management Institute | FEMA | |
| LMPC | Labor-Management Partnership Council | FEMA | |
| LMR | Living Marine Resource | FEMA | |
| LMS | Learning Management System | MGMT | |
| LNG | Liquefied Natural Gas | USCG | S&T | |
| LNO | Liaison Officer | FEMA | |
| LOA | Letter of Agreement | FEMA | |
| LOAD | Loadmaster | FEMA | |
| LOAEL | Lowest Observed Adverse Effect Level | FEMA | |
| LOC | Letter of Credit | FEMA | |
| LOC | Levels of concern | FEMA | |
| LOC | Line of Communication | FEMA | |
| LOC | Library of Congress | DHS | |
| LOCA | Loss of Coolant Accident | FEMA | |
| LOC-TFCS | Letter of Credit - Treasury Financial Communications System | FEMA | |
| LODR | Letter of Determination Review | FEMA | |
| LOEP | Louisiana Office of Emergency Preparedness | FEMA | |
| LOFR | Liaison Officer | FEMA | |
| LOG | Logistics | FEMA | |
| LOI | Letter of Instruction | FEMA | |
| LOI | Letter of Intent | FEMA | |
| LOINC | Logical Observation Identifiers Names and Codes | FEMA | |
| LOMA | Letter of Map Amendment | FEMA | |
| LOMC | Letter of Map Change | FEMA | |
| LOMC-VALID | Letter of Map Change Revalidation | FEMA | |
| LOMR | Letter of Map Revision | FEMA | |
| LOMR-F | Letter of Map Revision Based on Fill | FEMA | |
| LOP | level of protection | MGMT | |
| LOP | Legal Orientation Program | FEMA | |
| LOS | Line of Sight | FEMA | |
| LOSA | Logistical Operations Staging Area | FEMA | |
| LOSAP | Length-of-service Award Program | FEMA | |
| LOSSEST | Loss Estimation | FEMA | |
| LOU | Limited official use | DHS | |
| LPA | Legislative and Public Affairs | FEMA | |
| LPDP | Livestock Preservation Donation Program | FEMA | |
| LPG | Liquefied Petroleum Gas | FEMA | |
| LPN | Licensed Practical Nurse | FEMA | |
| LPOC | Last Port of Call | CBP | USCG | |
| LPPC | Local Preparedness and Prevention Council | FEMA | |
| LPR | lawful permanent resident | MGMT | |
| LPR | Lawful Permanent Resident (status) | CBP | USCIS | |
| LPR | Legal Permanent Resident (person) | CBP | USCIS | PLCY | |
| LPZ | Low Population Zone | FEMA | |
| LR | Limited Response | FEMA | |
| LRA | Louisiana Recovery Authority | FEMA | |
| LR-BSDS | Long Range Biological Standoff Detection System | FEMA | |
| LRC | Learning Resource Center | FEMA | |
| LRC | Logistics Resource Center | FEMA | |
| LRC | Logistics Response Center | FEMA | |
| LRCT | long range cordless telephone switch | S&T | |
| LRFD | Load and Resistance Factor Design | FEMA | |
| LRIP | Low Rate Initial Production | FEMA | |
| LRIT | long range identification and tracking | PLCY | |
| LRMP | Long Range Management Plan | FEMA | |
| LRN | Laboratory Response Network | S&T | |
| LRT | Long Range Tracker | CBP | |
| LRU | Lowest Replaceable Unit | FEMA | |
| LS | Logistics Support | FEMA | |
| LS | Lump Sum | FEMA | |
| LSA | Logistics Staging Area | FEMA | |
| LSC | Life Safety Code (National Fire Protection Association 101) | FEMA | |
| LSC | Legal Services Corporation | OGC | |
| LSC | Life Support Center | FEMA | |
| LSC1 | Logistics Section Chief Type 1 | FEMA | |
| LSC2 | Logistics Section Chief Type 2 | FEMA | |
| LSCAD | Lightweight Stand-off Chemical Agent Detector | FEMA | |
| LSCD | Life Safety Code Deficiency | FEMA | |
| LSCT | Line Scout | FEMA | |
| LSE | Local Subscriber Environment | FEMA | |
| LSFE | Life Safety and Fire Engineering | FEMA | |
| LSFE | Life Safety and Fire Engineering Branch of FEMA Office of Occupational Safety, Health & Environment (OSHE) | FEMA | |
| LSFP | Life Safety and Fire Protection | FEMA | |
| LSFP | Life Safety and Fire Protection Program | FEMA | |
| LSG | Large Scale Game | FEMA | |
| LSP | Lump Sum Payment | FEMA | |
| LSS | Laboratory Scientific Services | S&T | |
| LSS | Life Support System | FEMA | |
| LSU | Louisiana State University (NDPC) | FEMA | |
| LSV | Logistical Staging Vehicle | FEMA | |
| LT | Lieutenant (aka: Lt or Lieut) | FEMA | |
| LTA | Lead Technical Authority | MGMT | |
| LTA | Lighter Than Air | FEMA | |
| LTATP | Land Transportation Anti-terrorism Training Program | FLETC | |
| LTCR | Lost Time Case Rate | FEMA | |
| LTD | Limited | DHS | |
| LTG | Lieutenant General | FEMA | |
| LTL | Less-than Truck Load | FEMA | |
| LTR | Long-Term Recovery | FEMA | |
| LTRC | Long Term Recovery Committee | FEMA | |
| LTRC | Long Term Recovery Coordinator | FEMA | |
| LTRO | Long Term Recovery Office | FEMA | |
| LUC | land use control | DHS | |
| LULC | Land Use and Land Cover | FEMA | |
| LVA | Low Volatility Agent | FEMA | |
| LVB | Large Vehicle Bomb | FEMA | |
| LVBIED | large vehicle-borne improvised explosive device | S&T | |
| LWDR | Lost Work Day Rate | FEMA | |
| LWF | Lutheran World Federation | FEMA | |
| LWOP | Leave Without Pay | FEMA | |
| LWR | Light Water Reactor | FEMA | |
| LYNX | Central Florida Regional Transportation Authority | FEMA | |
| LZ | Landing Zone | FEMA | |
| m | meter | FEMA | |
| M&A | Management and Administrative | FEMA | |
| M&IE | Meals and Incidental Expenses | FEMA | |
| M&IE | Miscellaneous and Incidental Expenses | FEMA | |
| M&S | Modeling and Simulation | FEMA | |
| M/S | Meters per Second | FEMA | |
| M/V | Merchant Vessel | CBP | USCG | |
| MA | Marshalling Area | FEMA | |
| MA | Mission Assignment | FEMA | |
| MAA | Mutual Aid Agreement | FEMA | |
| MAAD | Mobile Asset Activities Document | FEMA | |
| MAAFS | Mid-Atlantic Association of Forensic Scientists | USSS | |
| MABAS | Mutual Aid and Box Alarm System | FEMA | |
| MAC | Multiple award contract | USCG | |
| MAC | Mapping and Analysis Center | FEMA | |
| MAC | Mission Assignment Coordinator | FEMA | |
| MAC | Mitigation Assistance Clinic | FEMA | |
| MAC | Monitoring and Analysis Coordinator | FEMA | |
| MAC | Multi-Agency Command | FEMA | |
| MAC | multiagency committees | FEMA | |
| MAC | Multiagency Coordinating (Entity) | FEMA | |
| MAC | Multiagency Coordination | FEMA | |
| MAC Entity | Multiagency Coordinating Entity | FEMA | |
| MACA | Military Assistance to Civil Authorities | FEMA | |
| MACC | Multi Agency Crime Center | ICE | |
| MACC | Multiagency Command Center | FEMA | |
| MACC | Multi-Agency Coordination Center | FEMA | |
| MACDIS | Military Assistance for Civil Disturbances | FEMA | |
| MACGp | Multi-Agency Coordination Group | FEMA | |
| MACOM | Major Command | FEMA | |
| MACS | Multi-Agency Coordination System | FEMA | |
| MAEC | Mid-America Earthquake Center | FEMA | |
| MAELU | Mutual Atomic Energy Liability Underwriters | FEMA | |
| MAF | Master Appropriation File | FEMA | |
| MAFC | MAFFS Clerk | FEMA | |
| MAFFS | Modular Airborne Fire Fighting System | FEMA | |
| MAGIC | Mid-America Geographic Information Council | FEMA | |
| MaHIMS | Medical and Health Incident Management System | FEMA | |
| MALE | Medium Altitude Long Endurance (see also HALE) | USCG | |
| MANPADS | Man Portable Air Defense System | OGC | |
| MAOC | Military Air Operations Coordinator | FEMA | |
| MAPs | Motorist Assist Points | FEMA | |
| MAR | Monthly Accomplishments Report | FEMA | |
| MARAC | Mutual Aid Regional Advisory Committee | FEMA | |
| MARAD | Maritime Administration | FEMA | TSA | USCG | |
| MARC | Maryland Rail Commuter | FEMA | TSA | |
| MARC | Mid-America Regional Council | FEMA | |
| MAREP | Marine Report | FEMA | |
| MARFORLANT | Marine Forces Atlantic | FEMA | |
| MARPLOT | Mapping Applications for Response, Planning, and Local Operational Tasks | FEMA | |
| MARR | Mission Assignment Reimbursement Request | FEMA | |
| MARS | Military Affiliated Radio System | FEMA | |
| MARS | Mobile Analytical Response System | FEMA | |
| MARS | Multi-function Acquisition and Reporting System | FEMA | |
| MARSA | Military Assumes Responsibility for Separation of Aircraft | FEMA | |
| MARSEC | Maritime Security | USCG | |
| MARSEC | maritime security level | PLCY | |
| MarshMALLOW | Marsh Management Activities for Learning the Lifestyles of Wildlife | FEMA | |
| MART | Morning Advisory Risk Threat (see also DART and EART) | FEMA | |
| MAS | Mapping Activity Statement | FEMA | |
| MASF | Mobile Aeromedical Staging Facility | FEMA | |
| MASFO | Multi-Agency Strike Force Operation | USCG | |
| MASH | Mobile Army Surgical Hospital | FEMA | |
| MASINT | Measurement and Signature Intelligence | TSA | I&A | OPS | |
| MAST | Maritime Security and Strategic Toolkit | FEMA | CISA | |
| MAST | Midwestern Alliance of Sovereign Tribes | FEMA | |
| MAST | Military Assistance to Safety and Traffic | FEMA | |
| MAST | Mitigation Advisors' Strategic Tracker | FEMA | |
| MAT | Mobilization Assistance Team | FEMA | |
| MATES | Mobilization and Training Equipment Site | FEMA | |
| MATF | Multi-Agency Task Force | FEMA | |
| MATRIX | Multistate Anti-Terrorism Information Exchange | I&A | |
| MATTS | Marine Asset Tag Tracking System | S&T | |
| MATTS | Mobile Air Transportable Telecommunications System | FEMA | |
| MAV | Micro Air Vehicle | I&A | |
| MB | Megabyte | FEMA | |
| mb | millibar | FEMA | |
| MBA | Master of Business Administration | FEMA | |
| MBO | Management by Objectives | FEMA | |
| MBPS | Megabytes per Second | FEMA | |
| MBTA | Migratory Bird Treaty Act | FEMA | |
| MC | Marine Corps | FEMA | |
| MC | Member of Congress | FEMA | |
| MC | Mobilization Center | FEMA | |
| MCA | Multi-Channel Analyzer | FEMA | |
| MCAD | Military Crew Advisor | FEMA | |
| M-CAST | Medical Capabilities Assessment & Status Tool | FEMA | |
| MCB | Movement Coordination Branch | FEMA | |
| MCC | Major Cities [police] Chiefs | FEMA | S&T | |
| MCC | Master Control Cell | FEMA | |
| MCC | Mission Control Center | FEMA | |
| MCC | Mobility Control Center | FEMA | |
| MCC | Movement Coordination Center | FEMA | |
| MCD | Medical Crew Director | FEMA | |
| MCE | Maximum Credible Event | FEMA | |
| MCEER | Multidisciplinary Center for Earthquake Engineering Research | FEMA | |
| MCF | Mass Care and Feeding | FEMA | |
| MCF | Movement Coordination Function | FEMA | |
| MCI | Mass Casualty Incident | FEMA | |
| MCL | maximum contaminant level | DHS | |
| MCLG | maximum contaminant level goal | DHS | |
| MCMC | Mid-Continent Mapping Center | FEMA | |
| MCMT | Mobilization Center Management Team | FEMA | |
| MCO | MERS Coordination Office | FEMA | |
| MCOC | Marine Corps Operations Center | FEMA | |
| MCOE | Metadata Center of Excellence (see EDMO) | MGMT | |
| MCR | Military Communications Representative | FEMA | |
| MCS | Movement Coordination System | FEMA | |
| MCSAP | Motor Carrier Safety and Assistance Program | FEMA | TSA | |
| MCU | Movement Coordination Unit | FEMA | |
| MCV | Mobile Coordinating Vehicle | FEMA | |
| MD | Management Directive | FEMA | |
| MD | Medical Doctor | FEMA | |
| MDA | Maritime Domain Awareness | USCG | |
| MDC | Maintenance and Deactivation Contracts | FEMA | |
| MDD | Metal Detection Device | TSA | |
| MDF | Medical, Dental and Funeral | FEMA | |
| MDRC | Mobile Disaster Recovery Center | FEMA | |
| MDRO | Mission Disaster Relief Officer | FEMA | |
| MDRV | Mobile Disaster Recovery Vehicle | FEMA | |
| MDS | Mennonite Disaster Service | FEMA | |
| MDST | Mountain Daylight Savings Time (see MDT) | FEMA | |
| MDT | Mountain Daylight Time (GMT - 6) | FEMA | |
| ME | Medical Examiner | FEMA | |
| MEA | Multi-Role Enforcement Aircraft | ICE | |
| MEA | Major Emergency Action | FEMA | |
| MEAG | Major Emergency Action Guide | FEMA | |
| MEAP | Mobile Environmental Analytical Platform | FEMA | |
| MED | Medium | FEMA | |
| MEDEVAC | Medical Evacuation | FEMA | |
| MEDL | Medical Unit Leader | FEMA | |
| MEDRED | Medical Readiness (OHA/MEDRED) | DHS | |
| MEEMCN | Minimum Essential Emergency Medical Communications Network | FEMA | |
| MEF | Mission Essential Function | FEMA | |
| MEG | Medical Evaluation Guidance | FEMA | |
| MEIR | Medical Effects of Ionizing Radiation | FEMA | |
| MEL | Mobile-Erector Launcher | FEMA | |
| MEMA | Motor & Equipment Manufacturers Association | ICE | |
| MEMA | Maine Emergency Management Agency | FEMA | |
| MEMA | Maryland Emergency Management Agency | FEMA | |
| MEMA | Massachusetts Emergency Management Agency | FEMA | |
| MEMA | Mississippi Emergency Management Agency | FEMA | |
| MEMA | Missouri Emergency Management Agency | FEMA | |
| MEMU | Mass Evacuation Management Unit | FEMA | |
| MEOW | Maximum Envelope of Water | FEMA | |
| MEOW | Maximum Envelope of Winds | FEMA | |
| MEP | Management Engineering Plan | FEMA | |
| MEPI | Middle East Partnership Initiative | DHS | |
| MEPP | Master Exercise Practitioner Program | FEMA | |
| MERRT | Medical Emergency Radiological Response Team | FEMA | |
| MERS | Mobile Emergency Response Support | FEMA | |
| MERSA | Mobile Emergency Response Support Assets | FEMA | |
| MET | Meteorological | FEMA | |
| MET | Meteorologist | FEMA | |
| MET | Mission Essential Task | FEMA | |
| METAR | Management Evaluation Technical Assessment Review | FEMA | |
| METAR | Meteorological Aviation Report | FEMA | |
| METL | Mission-Essential Task List | FEMA | |
| METOC | Meteorological and Oceanographic | FEMA | |
| METSAT | Meteorological Satellite | FEMA | |
| MeV | Megaelectronvolt | FEMA | |
| meV | millielectronvolt | FEMA | |
| MEWT | Mobile Electronic Warfare Technologies | FEMA | |
| MFAS | Marriage Fraud Amendment System | USCIS | |
| MFR | Memorandum For the Record | FEMA | |
| MFRI | Maryland Fire and Rescue Institute | FEMA | |
| MFTR | Manufacturer | FEMA | |
| MG | Marsh Vegetation (Line) | FEMA | |
| mg | milligram | FEMA | |
| MG/M3 | Milligrams per Cubic Meter | FEMA | |
| MG-MIN/M3 | Milligram Minutes per Cubic Meter | FEMA | |
| MGMT | Management | DHS | |
| MGMT | Management [Directorate] | MGMT | |
| MH | Manufactured Housing | FEMA | |
| MH | Mental Health | FEMA | |
| MH | Mobile Home | FEMA | |
| MHC | Mobile Health Clinic | FEMA | |
| MHE | Materiel Handling Equipment | FEMA | |
| MHEC | Military Helicopter Crewmen | FEMA | |
| MHEM | Military Helicopter Manager | FEMA | |
| MHMS | Military Helicopter Manager Supervisor | FEMA | |
| MHS | Message Handling System | FEMA | |
| MHTGR | Modular High Temperature Gas Reactor | FEMA | |
| MHW | Mean High Water | FEMA | |
| MHWL | Mean High Water Line | FEMA | |
| MHz | Megahertz | FEMA | |
| MI | Major Incident (medical) | FEMA | |
| MI | Middle Initial | FEMA | |
| MI2 | Multi-level-secure Information Infrastructure | FEMA | |
| MIC | Media Information Center | FEMA | |
| MIC | Meteorologist in Charge | FEMA | |
| MICS | Monitoring Information on Contracted Studies (System) | FEMA | |
| MIDAS | Micro-fluidic Integrated DNA Analysis System | FEMA | |
| MIEP | Mass Immigration Emergency Plan | FEMA | |
| MIFC | Maritime Intelligence Fusion Center | USCG | |
| MIIS | Microsoft Identity Integration Server | MGMT | |
| MIL | Military Advisor's Office | DHS | |
| MILES | Multiple Integrated Laser Engagement System | FEMA | |
| MIL-STD | Military Standard | FEMA | |
| MIM | Major Incident Management (medical) | FEMA | |
| MIME | Multi-purpose Internet Mail Extensions | FEMA | |
| MIN | Minimum | FEMA | |
| MIN | Mobile Identification Number | FEMA | |
| MIND | Maritime Interceptor for Nuclear Detection | S&T | CWMD | |
| MINICAM | Miniature Chemical Agent Monitor | FEMA | |
| MIP | management-in-place [asbestos] | DHS | |
| MIPR | Military Interdepartmental Purchase Request | FEMA | |
| MIPT | Memorial Institute for the Prevention of Terrorism | FEMA | |
| MIRP | Military Improved Response Program | FEMA | |
| MIRV | Multiple Independent Re-entry Vehicle | FEMA | |
| MIS | Management Information System | FEMA | |
| MISLE | Maritime Information for Safety and Law Enforcement | USCG | |
| MIT | Mitigation | FEMA | |
| MITT | Mobile Implementation Training Team | FEMA | |
| M-JPEG | Motion JPEG | FEMA | |
| MKT | Mobile Kitchen Trailer | FEMA | |
| MLAT | Mutual Legal Assistance Treaty | I&A | |
| MLD | Median Lethal Dose | FEMA | |
| MLETP | Marine Law Enforcement Training Program | FLETC | |
| MLH | Medium Lift Helicopter | ICE | |
| MLOS | Microwave Line of Sight | FEMA | |
| MLW | Mean Low Water | FEMA | |
| mm | millimeter | FEMA | |
| MMA | Major Metropolitan Area | FEMA | |
| MMC | Main Media Center | FEMA | |
| MMCE | Medical Management of Chemical Exposure | FEMA | |
| MMD | Merchant Mariner Document | USCG | |
| MMI | Modified Mercalli Intensity | FEMA | |
| MMIS | Municipal Management Information System | FEMA | |
| MMPA | Marine Mammal Protection Act | FEMA | |
| MMPAC | Merchant Marine Personnel Advisory Committee | USCG | |
| MMRS | Metropolitan Medical Response System | FEMA | |
| MMS | Minerals Management Service | FEMA | |
| MMST | Metropolitan Medical Strike Team | FEMA | |
| MMWR | Morbidity and Mortality Weekly Report | FEMA | |
| MNAP | Mapping Needs Assessment Process | FEMA | |
| MNS | Mission Needs Statement | FEMA | |
| MNUSS | Map Needs Update Support System | FEMA | |
| MO | Medical Officer | FEMA | |
| MO | Method of operation | DHS | |
| MOA | Memorandum of Agreement | DHS | |
| MOB | Main Operating Base | FEMA | |
| MOB | Mobilization (or Mobilize) | FEMA | |
| MOB Center | Mobilization Center | FEMA | |
| MOC | Mobile Operations Center | FEMA | |
| MOC | Maritime Operations Center | PLCY | |
| MODEM | Modulator/Demodulator | FEMA | |
| MODU | Mobile Offshore Drilling Unit | FEMA | |
| MOE | measure of effectiveness | MGMT | |
| MOM | Maximum of Maximums | FEMA | |
| MOM | Middle of Month | FEMA | |
| MOOTW | Military Operations Other Than War | FEMA | |
| MOP | measure of performance | MGMT | |
| MOPP | Mission-Oriented Protective Posture | FEMA | |
| MORE | Making Officer Redeployment Effective | FEMA | |
| MOS | measure of suitability | MGMT | |
| MOSS | Management Operations and Student Support | FEMA | |
| MOU | Memorandum of understanding | DHS | |
| MOX | Mixed Oxide Fuels | FEMA | |
| MP | Management Profiler | FEMA | |
| MP | Military Police | FEMA | |
| MPA | Maritime Patrol Aircraft | ICE | |
| MPAC | Muslim Public Affairs Council | CRCL | |
| MPC | Main Press Center | FEMA | |
| MPC | Maximum Permissible Concentration | FEMA | |
| MPC | Mid-term Planning Committee | FEMA | |
| MPC | Mid-term Planning Conference | FEMA | |
| MPD | Maximum Potential Destruction | FEMA | |
| MPE | Maximum Permissible Exposure | FEMA | |
| MPEG | Motion Picture Expert Group | FEMA | |
| MPH | Miles per Hour | FEMA | |
| MPPP | Mortgage Portfolio Protection Program | FEMA | |
| MPS | Mission Planning System | FEMA | |
| MPU | Microprocessor Unit | FEMA | |
| MPU | Mobile Power Unit | FEMA | |
| MQIT | Medical Quality Improvement Team | FEMA | |
| MQM | Medical Quality Management | FEMA | |
| MQM Program | Medical Quality Management Program | DHS | |
| MR | Medical Records | FEMA | |
| MR | Medical Response | FEMA | |
| mR | milliroentgen/millirem | FEMA | |
| mR/h | milliRoentgen per hour | FEMA | |
| MRA | Monthly Rental Assistance | FEMA | |
| MRA | Mortgage and Rental Assistance | FEMA | |
| MRAT | Medical Radiobiology Advisory Team | FEMA | |
| MRC | Medical Reserve Corps | FEMA | CISA | |
| MRC | Management Review Council | FEMA | |
| MRC | Monthly Recurring Costs | FEMA | |
| MRE | Meal, Ready-to-Eat | FEMA | USCG | |
| mRem | millirem | FEMA | |
| MRF | Medium Range Forecast | FEMA | |
| MRI | Mean Recurrence Interval | FEMA | (Video) CompTIA Security+ Acronyms/Tips Part 1 |
| MRIC | Mobile Registration Intake Center | FEMA | |
| MRMC | Medical Research and Materiel Command | FEMA | |
| MRO | Mandatory Removal Offense | ICE | |
| MRP | Machine readable passport | CBP | |
| MRP | Minimal Repair Program | FEMA | |
| MRR | Measurement Residual Ratio | FEMA | |
| MRRS | MERS Response Reporting System | FEMA | |
| MRT | Medical Response Team | FEMA | |
| MRV | Mobile Response Van | FEMA | |
| MRV | Mobile Response Vehicle | FEMA | |
| MRV | Multi-Radio Van | FEMA | |
| MRV | Multi-Radio Vehicle | FEMA | |
| MS&G | Models, Simulations, and Games | FEMA | |
| MS-1 | Medical Service – 1 (Hospital) | FEMA | |
| MS4 | municipal separate storm water sewer system | DHS | |
| MSA | Metropolitan Statistical Area | FEMA | |
| MSA | Modeling, Simulation, & Analysis | FEMA | |
| MSA | Mutual Support Agreement | FEMA | |
| MSC | Major Subordinate Command | FEMA | |
| MSC | Map Service Center | FEMA | |
| MSC | Marine Safety Center | FEMA | |
| MSC | Mobile Switching Center | DHS | |
| MSCA | Military Support to Civil Authorities | FEMA | |
| MSCLEA | Military Support to Civilian Law Enforcement Agencies | FEMA | |
| MSD | Military Support Detachment | FEMA | |
| MSD | Musculoskeletal Disorder | FEMA | |
| MSDS | Manpower Standards Development System | FEMA | |
| MSDS | Material Safety Data Sheet | FEMA | |
| MSE | MERS Support Element | FEMA | |
| MSEL | Master Scenario Events List | FEMA | |
| MSF | Mobile Screening Force | TSA | |
| MSFCMA | Magnuson-Stevens Fisheries Conservation and Management Act | FEMA | |
| MSFO | Marine Safety Field Office | FEMA | |
| MSHA | Mine Safety and Health Administration | FEMA | |
| MSI | Minority-Serving Institution | CRCL | MGMT | |
| MSIA | Metadata Standards for Information Assurance | FEMA | |
| MSIC | Missile and Space Intelligence Center | S&T | |
| MSIIP | Minority Serving Institutions Internship Program | FEMA | |
| MSIS | Marine Safety Information System | FEMA | |
| MSIs | Minority Serving Institutions | FEMA | |
| MSL | Mean Sea Level | FEMA | |
| MSLO | Military Support Liaison Officer | FEMA | |
| MSO | Maritime Security Operations | USCG | |
| MSO | Marine Safety Office | FEMA | |
| MSO | Military Support Officer | FEMA | |
| MSPB | Merit Systems Protection Board | FEMA | MGMT | OPA | |
| MSR | Main Supply Route | FEMA | |
| MSRAM | Maritime Security Risk Assessment Model | USCG | CISA | |
| MSST | Maritime Safety and Security Team | USCG | |
| MST | Management Support Team | FEMA | |
| MST | Master | FEMA | |
| MST | METRO Strike Team | FEMA | |
| MST | Mountain Standard Time (GMT - 7) | FEMA | |
| MSU | Management Support Unit | FEMA | |
| MSU | Marine Safety Unit | FEMA | |
| MSU | Medical Support Unit | FEMA | |
| MSW | municipal solid waste | DHS | |
| MT | Megaton | FEMA | |
| MT | metric ton | FEMA | |
| MT | Mitigation (FEMA/MT) | DHS | |
| MTA | Material Transfer Area | FEMA | |
| MTF | Medical Treatment Facility | FEMA | |
| MTI | Methodology Technical Implementation | CISA | |
| MTMC | Military Traffic Management Command | FEMA | |
| MTOE | Modified Table of Organization and Equipment | FEMA | |
| MTOW | Maximum Takeoff Weight | TSA | |
| MTP | Master Trainer Program | FEMA | |
| MTR | Maritime Training Response | FEMA | |
| MTR | Military Training Route | FEMA | |
| MTS | marine transportation system | PLCY | |
| MTSA | Maritime Transportation Security Act | TSA | USCG | |
| MTSP | Mass Transit Security Program | TSA | |
| MTT | Mobile Training Team | FEMA | |
| MTTR | mean time to repair | MGMT | |
| MTTRS | mean time to restore service | MGMT | |
| MUDAC | Meteorological and Unified Dose Assessment Center | FEMA | |
| MUF | Materials Unaccounted For | FEMA | |
| MUTCD | Manual of Uniform Traffic Control Devices | FEMA | |
| MVGP | Mission, Vision and Guiding Principles | FEMA | |
| MW | megawatt | FEMA | |
| MW | Microwave | FEMA | |
| MW | Mount Weather | FEMA | |
| MWA | Metropolitan Washington Area | FEMA | |
| MWCOG | Metropolitan Washington Council of Governments | FEMA | |
| MWEAC | Mount Weather Emergency Action Center | FEMA | |
| MWEOC | Mount Weather Emergency Operations Center | FEMA | |
| MWFRS | Main Wind Force Resisting System | FEMA | |
| MWH | megawatt hour | FEMA | |
| MWMD | Mount Weather Management Division | FEMA | |
| MWS | Marine Weather Statement | FEMA | |
| MXMS | Mixmaster | FEMA | |
| M-ZONE | High Mudflow Hazard Area | FEMA | |
| N/A | Not affected | DHS | |
| N/A | Not applicable | DHS | |
| N/P | Not Provided | FEMA | |
| N2O | nitrous oxide | DHS | |
| NA | Northeastern Area | FEMA | |
| NA | North American | DHS | |
| NAAE | National Association of Agricultural Employees | MGMT | |
| NAAK | Nerve Agent Antidote Kit | FEMA | |
| NAAP | Newport Army Ammunition Plant | FEMA | |
| NAAQS | National Ambient Air Quality Standards | FEMA | |
| NAAT | North American Aviation Trilateral | TSA | |
| NAC | National Advisory Committee | FEMA | |
| NAC | National Advisory Council | FEMA | |
| NAC | Nebraska Avenue Complex | DHS | |
| NAC | National Agency Check | FEMA | MGMT | |
| NAC/AEGL | National Advisory Committee on Acute Exposure Guidelines Levels (for Chemical Substances) | FEMA | |
| NACA | National Air Carrier Association | TSA | |
| NACCHO | National Association of County and City Health Officials | FEMA | |
| NACD | National Association of Corporate Directors | FEMA | |
| NACDD | National Association of Councils on Developmental Disabilities | CRCL | |
| NACE | National Association of County Engineers | FEMA | |
| NACI | National Agency Check with Inquiries | FEMA | |
| NACIC | National Counterintelligence Center | I&A | |
| NACo | National Association of Counties | FEMA | |
| NACS | NEMIS Access Control System | FEMA | |
| NACS | Netware Asynchronous Communications Service | FEMA | |
| NACWA | National Association of Clean Water Agencies | FEMA | |
| NAD27 | North American Datum of 1927 | FEMA | |
| NAD83 | North American Datum of 1983 | FEMA | |
| NADB | National Assets Data Base | CISA | |
| NADO | National Association of Development Organizations | FEMA | |
| NAEMT | National Association of Emergency Medical Technicians | FEMA | |
| NAERG | North American Emergency Response Guidebook | FEMA | |
| NAFAX | National Facsimile Network | FEMA | |
| NAFSMA | National Association of Flood & Stormwater Management Agencies | FEMA | |
| NAFTA | North America Free Trade Agreement | FEMA | |
| NAFTZ | National Association of Free Trade Zones | CBP | ICE | |
| NAHB | National Association of Home Builders | FEMA | |
| NAHERC | National Animal Health Emergency Response Corps | FEMA | |
| NAHF | National Association of Hispanic Firefighters | FEMA | |
| NAI | North American Initiative | PLCY | |
| NaI(Tl) | Sodium Iodide Doped with Thallium (scintillator) | FEMA | |
| NAIC | National Association of Insurance Commissioners | FEMA | |
| NAII | National Association of Independent Insurers | FEMA | |
| NAIIA | National Association of Independent Insurance Adjusters | FEMA | |
| NAILS | National Automated Immigration Lookout System | CBP | USCG | USCIS | |
| NAMRI | Naval Medical Research Institute | FEMA | |
| NANDA | North American Nuclear Detection Architecture | FEMA | |
| NAOC | National Airborne Operations Center | FEMA | |
| NAOS | North American Atmospheric Observing System | FEMA | |
| NAP | Nuclear Assessment Program | S&T | |
| NAP | National AIDS Policy | FEMA | |
| NAPA | National Academy of Public Administration | FEMA | |
| NAPI | National Arson Prevention Initiative | FEMA | |
| NAPO | National Organization of Police Organizations | CISA | |
| NARA | National Archives and Records Administration | DHS | |
| NARAC | National Atmospheric Release Advisory Center | FEMA | CISA | |
| NARCL | Nuclear Accident Response Capabilities Listing | FEMA | |
| NARFE | National Active & Retired Federal Employees Association | FEMA | |
| NARP | National Agriculture Release Program | CBP | |
| NARP | Nuclear Accident Response Plan | FEMA | |
| NARP | Nuclear Accident Response Procedures | FEMA | |
| NARS | National Archives and Records Service | MGMT | |
| NARSAP | National Advanced Remote Sensing Applications Program | FEMA | |
| NARTC | National Advanced Resource Technology Center | FEMA | |
| NAS | National Academy of Sciences | FEMA | |
| NASA | National Aeronautics and Space Administration | DHS | |
| NASAR | National Association for Search and Rescue | FEMA | CISA | |
| NASBLA | National Association of State Boating Law Administrators | USCG | |
| NASCDD | National Association of State Civil Defense Directors | FEMA | |
| NASCIO | National Association of State Chief Information Officers | S&T | MGMT | |
| NASEMSD | National Association of State Emergency Medical Services Directors | FEMA | |
| NASEMSO | National Association of State Emergency Medical Officials | FEMA | S&T | CWMD | |
| NASF | National Association of State Foresters | FEMA | |
| NASFM | National Association of State Fire Marshals | FEMA | |
| NASNA | National Association of 9-1-1 Administrators | FEMA | |
| NASTTPO | National Association of State Title Three Program Officials | FEMA | |
| NASULGC | National Association of State Universities and Land-Grant Colleges | USCIS | S&T | |
| NATA | National Air Transportation Association | TSA | S&T | |
| NATCA | National Air Traffic Controllers Association | TSA | |
| NATO | North Atlantic Treaty Organization | FEMA | PLCY | |
| NAVAID | Navigational Aid | FEMA | |
| NAVC | National Audio-Visual Center | FEMA | |
| NAVD88 | North American Vertical Datum of 1988 | FEMA | |
| NAWAS | National Warning System | FEMA | |
| NAWAS/BCC | National Warning System Bridge and Conference Controller | FEMA | |
| NAWC | National Association of Water Companies | FEMA | |
| NAWE | National Association for Waterfront Employees | MGMT | |
| NBACC | National Biodefense Analysis and Countermeasures Center | S&T | MGMT | |
| NBAF | National Bio- and Agro-Defense Facility | S&T | |
| NBC | Nuclear, Biological and Chemical | FEMA | |
| NBFAC | National Bioforensic Analysis Center | S&T | |
| NBFSPQ | National Board on Fire Service Professional Qualifications | FEMA | |
| NBHPP | National Bioterrorism Hospital Preparedness Program | FEMA | |
| NBIC | National Biosurveillance Integration Center | CWMD | |
| NBIS | National Biosurveillance Integration System | FEMA | |
| NBSAC | National Boating Safety Advisory Council | USCG | |
| NBSCAB | National Bomb Squad Commanders Advisory Board | FEMA | |
| NBSG | National Biosurveillance Group | FEMA | |
| NBTA | National Business Travel Association | TSA | |
| NBWDA | National BioWeapons Defense Analysis Center | S&T | |
| NC&B | Nuclear, Chemical and Biological | FEMA | |
| NCA | National Command Authority | FEMA | |
| NCAI | National Congress of American Indians | FEMA | |
| NCAP | National Corrective Action Program | FEMA | |
| NCAR | National Center for Atmospheric Research | FEMA | |
| NCAS | National Cyber Alert System | S&T | |
| NCATF | National Church Arson Task Force | FEMA | |
| NCAVC | National Center for the Analysis of Violent Crime | FEMA | |
| NCBFAA | National Customs Brokers and Forwarders Association of America | CBP | |
| NCC | National Continuity Coordinator | MGMT | |
| NCC | National Coordinating Center (for Telecommunications) | FEMA | |
| NCCC | National Council of the Churches of Christ | FEMA | |
| NCCC | National Civilian Conservation Corps (AmeriCorps) | FEMA | |
| NCCG | National Civilian Community Group | FEMA | |
| NCD | National Council on Disability | CRCL | |
| NCDDM | National Center for Disaster Decision Making | FEMA | CISA | |
| NCE | National Counterintelligence Executive | I&A | |
| NCEH | National Center for Environmental Health | FEMA | CISA | S&T | |
| NCEP | National Centers for Environmental Prediction | FEMA | |
| NCFPD | National Center for Food Protection and Defense | S&T | |
| NCFS | National Center for Forensic Science | ICE | |
| NCGIA | National Center for Geographic Information and Analysis | FEMA | |
| NCIC | National Crime Information Center | CBP | FEMA | |
| NCID | National Center for Infectious Diseases | FEMA | |
| NCIS | Naval Criminal Investigative Service | ICE | I&A | PLCY | PRIV | |
| NCISP | National Criminal Intelligence Sharing Plan | FEMA | |
| NCIT | National Council on International Trade (see NCITD) | FEMA | |
| NCITD | National Council on International Trade and Development | FEMA | |
| NCIX | Office of National Counterintelligence Executive | I&A | |
| NCJA | National Criminal Justice Association | FEMA | |
| NCLIS | National Commission on Libraries and Information Science | S&T | |
| NCMEC | National Center for Missing and Exploited Children | ICE | |
| NCO | Non-Commissioned Officer | FEMA | |
| NCP | National Continuity Programs (FEMA/NCP) | DHS | |
| NCP | National Oil and Hazardous Substances Pollution Contingency Plan (aka: "National Contingency Plan") | FEMA | |
| NCPC | National Capitol Planning Commission | FEMA | |
| NCPC | National Crime Prevention Council | FEMA | |
| NCPI | National Committee on Property Insurance | FEMA | |
| NCR | National Capitol Region | FEMA | |
| NCRC | National Capitol Region Coordination (FEMA/NCRC) | DHS | |
| NCRCG | National Cyber Response Coordination Group | FEMA | |
| NCRPM | National Council on Radiation Protection and Measurements | FEMA | |
| NCS | non-critical sensitive [position] | MGMT | |
| NCS | National Communications System | FEMA | CISA | I&A | |
| NCS | Net Control System | FEMA | |
| NCSA | National Center for Super-computing Applications | FEMA | |
| NCSA | North Carolina Sheriffs' Association | FEMA | |
| NCSC | National Cybersecurity Center | DHS | |
| NCSD | National Cybersecurity Division | CISA | S&T | I&A | |
| NCSD | National Communications System Directive | FEMA | |
| NCSH | National Communications System Handbook | FEMA | |
| NCSL | National Council of State Legislators | CISA | |
| NCSLLET | National Center for State & Local Law Enforcement Training, Advisory Committee to the | FLETC | |
| NCSM | National Communications System Manual | FEMA | |
| NCSP | National Cyber Security Partnership | CISA | OGC | |
| NCSP | National Communications Support Plan | FEMA | |
| NCSRM | National Communications Systems Regional Manager | FEMA | |
| NCSSA | National Cartographic Standards for Spatial Accuracy | FEMA | |
| NCTC | National Counterterrorism Center | DHS | |
| NCUA | National Credit Union Administration | FEMA | MGMT | OPA | |
| NCVIP | National Child Victim Identification Program | USSS | |
| NDA | National Defense Area | FEMA | |
| NDA | Nevada Department of Agriculture | FEMA | |
| NDA | Non-Disclosure Agreement | FEMA | |
| NDAA | Natural Disaster Assistance Act | FEMA | |
| NDAC | Network Design and Analysis Center | FEMA | |
| NDC | National Data Center | CBP | |
| NDEA | National Defense Emergency Authorization | FEMA | |
| NDEC | National Disaster Education Coalition | FEMA | |
| NDEP | National Digital Elevation Program | FEMA | |
| NDER | National Defense Executive Reserve | FEMA | |
| N-DEX | [Law Enforcement] National Data Exchange | OPS | PLCY | PRIV | |
| NDFD | National Digital Forecast Database | FEMA | |
| NDHS | National Disaster Housing Strategy (FEMA) | FEMA | |
| NDHTF | National Disaster Housing Task Force | FEMA | |
| NDIA | National Defense Industrial Association | CISA | S&T | |
| NDIC | National Drug Intelligence Center | ICE | |
| NDMC | National Drought Mitigation Center | FEMA | |
| NDMN | National Donations Management Network | FEMA | |
| NDMOC | National Disaster Medical Operations Center | FEMA | |
| NDMS | National Disaster Medical System | FEMA | I&A | |
| NDMSOSC | National Disaster Medical System Operations Support Center | FEMA | |
| NDPC | National Domestic Preparedness Consortium | FEMA | |
| NDPO | National Domestic Preparedness Office | CISA | |
| NDRSMP | National Distress and Response System Modernization Project (also known as “Rescue 21”) | FEMA | |
| NDS | National Defense Stockpile | FEMA | |
| NDS | National Detention Standards | FEMA | |
| NDS | Nuclear Detection System | FEMA | |
| NDTA | National Defense Transportation Association | TSA | |
| NDU | National Defense University | FEMA | |
| NDW | Naval District of Washington | DHS | |
| NE | New England | FEMA | |
| NE | Northeast | FEMA | |
| NEA | National Endowment for the Arts | FEMA | |
| NEARS | National Emergency and Alerting Response System | FEMA | |
| NEC | National Earthquake Center | FEMA | |
| NEC | National Electric Code | FEMA | |
| NECA | Newport Chemical Activity | FEMA | |
| NECC | National Emergency Coordination Center (see NRCC) | FEMA | |
| NECD | Newport Chemical Depot | FEMA | |
| NECLC | National Emergency Child Locator Center | FEMA | |
| NECN | National Emergency Communications Network | FEMA | |
| NECP | National Emergency Communications Plan | FEMA | |
| NED | National Exercise Division | FEMA | |
| NED | Nuclear Explosive Device | FEMA | |
| NEDCTP | National Explosives Detection Canine Team Program | TSA | |
| NEDSS | National Electronic Disease Surveillance System | I&A | |
| NEEP | National Earthquake Education Program | FEMA | |
| NEEP | National Exercise and Evaluation Program | FEMA | |
| NEET | National Exercise Evaluation Team | FEMA | |
| NEF | National Essential Function | FEMA | |
| NEFRLS | National Emergency Family Registry and Locator System | FEMA | |
| NEFSMA | New England Floodplain and Stormwater Managers Association | FEMA | |
| NEG | National Emergency Grant | FEMA | USCG | |
| NEH | National Endowment for the Humanities | FEMA | |
| NEHA | National Environmental Health Association | FEMA | |
| NEHRP | National Earthquake Hazards Reduction Program | FEMA | |
| NEI | Nuclear Energy Institute | FEMA | |
| NEIC | National Earthquake Information Center | FEMA | |
| NEIC | National Enforcement Investigations Center | FEMA | |
| NEIS | National Earthquake Information Service | FEMA | |
| NEMA | National Emergency Management Association | FEMA | FLETC | |
| NEMA | Nebraska Emergency Management Agency | FEMA | |
| NEMBCAP | National Emergency Management Baseline Capability Assessment Program | FEMA | |
| NEMIS | National Emergency Management Information System | FEMA | PRIV | |
| NEMSIS | National EMS Information System | FEMA | |
| NEMSPI | National Emergency Medical Services Preparedness Initiative | FEMA | |
| NEMT | National Emergency Management Team | FEMA | |
| NENA | National Emergency Number Association | FEMA | |
| NEO | Near-Earth Orbit | FEMA | |
| NEO | Non-combatant Evacuation Operation | FEMA | |
| NEOB | New Executive Office Building | FEMA | |
| NEOC | National Emergency Operations Center | FEMA | |
| NEP | National Exercise Program | FEMA | |
| NEPA | National Environmental Policy Act | FEMA | S&T | OGC | |
| NEPPC | National Emergency Prevention and Preparedness Council | FEMA | |
| NERC | North American Electric Reliability Council | FEMA | CISA | |
| NERR | National Emergency Resource Registry | PLCY | |
| NERRTC | National Emergency Response and Rescue Training Center (TEEX/NDPC) | FEMA | |
| NERT | National Emergency Response Team | FEMA | |
| NESC | National Exercise Simulation Center | FEMA | |
| NESEC | Northeast States Emergency Consortium | FEMA | |
| NESHAPs | National Emission Standards for Hazardous Air Pollutants | DHS | |
| NESN | Necessary Expenses and Serious Needs | FEMA | |
| NESP | National Environmental Studies Project | FEMA | |
| NESPM | National EMS Scope of Practice Model | FEMA | |
| NEST | Nuclear Emergency Search Team | FEMA | CWMD | |
| NESWG | National Earthquake Strategy Working Group | FEMA | |
| NET | No Earlier Than | FEMA | |
| NETAC | National Environmental Technology Application Center | FEMA | |
| NETAP | National Earthquake Technical Assistance Program | FEMA | |
| NETC | National Emergency Training Center | FEMA | |
| NEXRAD | Next Generation Weather Radar | FEMA | |
| NEXS | National Exercise Schedule | FEMA | S&T | |
| NEXUS | Next Generation Upper Weather System | FEMA | |
| NFA | National Fire Academy | FEMA | |
| NFA | National Fire Academy, Board of Visitors for the | FEMA | USFA | |
| NFAAA | National Fire Academy Alumni Association | FEMA | |
| NFAEB | National Fire & Aviation Executive Board | FEMA | |
| NFAR | No Further Action Required | FEMA | |
| NFC | National Finance Center | MGMT | |
| NFCD | National Finance Center Database | FEMA | |
| NFDA | National Flood Determination Association | FEMA | |
| NFDA | National Funeral Directors Association | FEMA | |
| NFDC | National Fire Data Center | FEMA | |
| NFES | National Fire Equipment System | FEMA | |
| NFFE | National Federation of Federal Employees | MGMT | |
| NFFF | National Fallen Firefighters Foundation | FEMA | USFA | |
| NFFS | Northeast Forest Fire Supervisors | FEMA | |
| NFI | National Flood Insurance | FEMA | |
| NFIB | National Foreign Intelligence Board | I&A | MGMT | PLCY | |
| NFIC | National Fire Information Council | FEMA | |
| NFIF | National Flood Insurance Fund | FEMA | |
| NFIP | National Foreign Intelligence Program | I&A | |
| NFIP | National Flood Insurance Program | FEMA | |
| NFIRA | National Flood Insurance Reform Act of 1994 | FEMA | |
| NFIRS | National Fire Incident Reporting System | FEMA | USFA | |
| NFMA | National Forest Management Act | FEMA | |
| NFOP | National Fugitive Operations Program | ICE | |
| NFP | Not For Profit | FEMA | |
| NFPA | National Fire Protection Association | FEMA | USFA | S&T | |
| NFPCA | National Fire Prevention and Control Administration | FEMA | |
| NFPE | National Fire Protection Equipment | FEMA | USFA | S&T | |
| NFR | Notice of Finding and Recommendation | FEMA | |
| NFS | National Forest System | FEMA | |
| NFSA | National Fire Sprinkler Association | FEMA | |
| NFSC | Narcotics Financing Strategy Center | ICE | |
| NFSCC | National Fire Science Curriculum Committee | FEMA | |
| NFSLO | National Fire Suppression Liaison Officer | FEMA | |
| NFTS | National File Tracking System (replaced RAFACS) | CBP | ICE | USCIS | I&A | PLCY | PRIV | |
| NG | National Guard | FEMA | |
| NGA | National Geospatial-Intelligence Agency | DHS | |
| NGA | National Governors Association | FEMA | CISA | |
| NGB | National Governing Body | FEMA | |
| NGB | National Guard Bureau | FEMA | |
| NGDC | National Geophysical Data Center | FEMA | |
| NGI | Next Generation Internet | FEMA | |
| NGIC | National Ground Intelligence Center [Army] | I&A | |
| NGLO | National Guard Liaison Officer | FEMA | |
| NGM | Nested Grid Model | FEMA | |
| NGN | Next-Generation Network | FEMA | |
| NGO | Non-Governmental Organization | FEMA | PLCY | |
| NGRS | National Geodetic Reference System | FEMA | |
| NGS | National Geodetic Survey | FEMA | |
| NGVD | National Geodetic Vertical Datum | FEMA | |
| NGVD29 | National Geodetic Vertical Datum of 1929 | FEMA | |
| NGWT | Next Generation Warning Tool | FEMA | |
| NHC | National Hurricane Center | FEMA | |
| NHPA | National Historic Preservation Act | FEMA | |
| NHSSS (also known as NH3S) | National Homeland Security Support System | FEMA | |
| NHSU | National Homeland Security University | FEMA | |
| NHTSA | National Highway Transportation Safety Administration | FEMA | TSA | |
| NHV | Natural Hazard Vulnerability | FEMA | |
| NI | No Insurance | FEMA | |
| NIAAA | National Institute on Alcohol Abuse and Alcoholism | FEMA | |
| NIAC | National Infrastructure Advisory Council | CISA | I&A | PLCY | |
| NIAC | NASA Institute for Advanced Concepts | S&T | |
| NIAC | National Iranian American Council | CRCL | |
| NIB | National Industries for the Blind | FEMA | |
| NIBC | National Interagency Biodefense Campus | FEMA | |
| NIBRS | National Incident Based Reporting System | CBP | TSA | PLCY | PRIV | |
| NIBS | National Institute of Building Sciences | FEMA | |
| NIC | National Intelligence Council | I&A | |
| NIC | National Instrumentation Center | FEMA | |
| NIC | NIMS Integration Center | FEMA | |
| NIC | National Integration Center | DHS | |
| NICACS | National Incident Control and Action Communication System | FEMA | |
| NICC | National Interagency Coordination Center | FEMA | |
| NICC | National Infrastructure Coordination Center | CISA | I&A | |
| NICCL | National Incident Communications Conference Line | FEMA | |
| NICCP | National Interdiction Command & Control Plan | ICE | |
| NICI | National Interagency Counterdrug Institute | FEMA | |
| NICRAT | National Incident Command Resource Allocation Tool | FEMA | |
| NICS | National Instant Background Check System | CBP | TSA | PLCY | PRIV | |
| NID | National Inventory of Dams | FEMA | |
| NID | National Intelligence Director (see correct DNI) | DHS | |
| NIEHS | National Institute of Environmental Health Services | FEMA | |
| NIEM | National Information Exchange Model | I&A | MGMT | |
| NIEOC | National Interagency Emergency Operations Center | FEMA | CISA | |
| NIER | National Industrial Equipment Reserve | FEMA | |
| NIF | National Ignition Facility | FEMA | |
| NIF | Non-Industrial Facility | FEMA | |
| NIFC | National Interagency Fire Center | FEMA | |
| NIFCC | National Interagency Fire Coordination Center | FEMA | |
| NIH | National Institutes of Health | DHS | |
| NIHS | National Institute for Hometown Security | S&T | |
| NII | National Information Infrastructure | FEMA | |
| NII | Non-Intrusive Inspection | CBP | |
| NII/GII | National Information Infrastructure/Global Information Infrastructure Initiatives | FEMA | |
| NIIMS | National Interagency Incident Management System | FEMA | |
| NIIS | Non-Immigrant Information System | CBP | |
| NIITP | National Investigative Interview Training Program | FLETC | |
| NIJ | National Institute of Justice | S&T | |
| NIMA | National Imagery and Mapping Agency (see NGA) | CBP | |
| N-IMAT | National Incident Management Assistance Team | FEMA | |
| NIMBY | Not In My Backyard | FEMA | |
| NIMCAST | National Incident Management Compliance Assurance Tool | FEMA | |
| NIMCAST | National Incident Management System Capability Assessment Support Tool (see NIMSCAST) | FEMA | |
| NIMG | National Interagency Mobilization Guide | FEMA | |
| NIMH | National Institutes of Mental Health | FEMA | |
| NIMO | National Incident Management Organization | FEMA | |
| NIMS | National Incident Management System | FEMA | CISA | |
| NIMS SC | NIMS Support Center | FEMA | |
| NIMS STEP | NIMS Supporting Technology Evaluation Program | FEMA | |
| NIMS/NET | National Incident Management System Network | FEMA | |
| NIMSCAST | National Incident Management System Capability Assessment Support Tool | FEMA | |
| NIMTO | Not In My Term of Office | FEMA | |
| NIOSH | National Institute for Occupational Safety and Health | FEMA | S&T | |
| NIP | National Immunization Program | FEMA | |
| NIP | National Intelligence Program | FEMA | |
| NIPC | National Infrastructure Protection Center | FEMA | I&A | |
| NIPF | National Intelligence Priority Framework | CISA | I&A | |
| NIPP | National Infrastructure Protection Plan | CISA | |
| NIPS | Numerically Integrated Profiling System | CBP | ICE | PRIV | |
| NIR | Non Ionizing Radiation | FEMA | |
| NIRSC | National Interagency Radio Support Cache | FEMA | |
| NIRT | Nuclear Incident Response Team | FEMA | CWMD | |
| NISAC | National Infrastructure Simulation and Analysis Center | CISA | S&T | |
| NISE | National Intelligence Support Element | FEMA | |
| NISP | National Industrial Security Program | PLCY | |
| NISPOM | National Industrial Security Program Operating Manual | FEMA | |
| NIST | National Institute of Standards and Technology | S&T | I&A | |
| NIUSR | National Institute for Urban Search and Rescue | FEMA | |
| NIVS | Non-immigrant Visa System | USCIS | I&A | PLCY | |
| NJBF | New Jersey Business Force | FEMA | |
| NJIC | National Joint Information Center | OPS | |
| NJTTF | National Joint Terrorism Task Force | I&A | |
| NLC | National League of Cities | FEMA | |
| NLC | National Location Code | FEMA | |
| NLD | Nunn-Lugar-Domenici | FEMA | |
| NLE | National-Level Exercise | FEMA | |
| NLECC | National Law Enforcement Coordination Center | FEMA | |
| NLETS | National Law Enforcement Telecommunications System | FEMA | USCG | I&A | |
| NLRA | National Labor Relations Authority | FEMA | |
| NLRB | National Labor Relations Board | MGMT | |
| NLS | National Language Standards | FEMA | |
| NLT | No later than | DHS | |
| NLZ | No Lone Zone | FEMA | |
| NM | Nautical Mile | FEMA | |
| NMAB | National Materials Advisory Board | FEMA | |
| NMAS | National Map Accuracy Standard | FEMA | |
| NMB | National Mediation Board | S&T | OGC | |
| NMC | National Meteorological Center | FEMA | |
| NMC | Non-Mission Capable | FEMA | |
| NMCC | National Master Control Cell | FEMA | |
| NMCC | National Military Command Center | FEMA | USCG | |
| NMD | National Mapping Division (of USGS) | FEMA | |
| NMETS | National Mass Evacuation Tracking System | FEMA | |
| NMFS | National Marine Fisheries Service | FEMA | |
| NMI | No Middle Initial | FEMA | |
| NMIC | National Maritime Intelligence Center | CBP | USCG | |
| NMJIC | National Military Joint Intelligence Center | FEMA | |
| NMO | National Terrorism Advisory System Management Office | I&A | |
| NMRI | Naval Medical Research Institute | FEMA | |
| NMRS | National Medical Response System | FEMA | |
| NMRT | National Medical Response Team | FEMA | |
| NMSAC | National Maritime Security Advisory Committee | USCG | |
| NMSP | National Maritime Security Plan | USCG | |
| NMSRA | National Maritime Strategic Risk Assessment | USCG | CISA | |
| NMSS | Nuclear Materials Safeguards and Security | FEMA | |
| NMT | New Mexico Tech (NDPC) | FEMA | |
| NMTSP | National Marine Transportation Security Plan | USCG | |
| NNALEA | National Native American Law Enforcement Association | FEMA | |
| NNEC | National Network Emergency Center | FEMA | |
| NNFC | National Network of Fusion Centers | OPS | PLCY | |
| NNO | National Night Out | OPA | |
| NNOB | National Network Operations Branch | FEMA | |
| NNOC | National Network Operations Center | FEMA | |
| NNRT | National Nurses Response Team (medical) | FEMA | |
| NNSA | National Nuclear Security Administration | DHS | |
| NO | National Office | FEMA | |
| No FEAR Act | Notification and Federal Employee Anti-discrimination and Retaliation Act of 2002 | FEMA | |
| NOA | notice of availability [NEPA} | DHS | |
| NOAA | National Oceanic and Atmospheric Administration | DHS | |
| NOAEL | No Observed Adverse Effects Level | FEMA | |
| NOBLE | National Organization of Black Law Enforcement Executives | TSA | CRCL | |
| NOC | DHS National Operations Center | I&A | |
| NOC | National Olympic Committee | FEMA | |
| NOC | National Operations Center (OPS/NOC) [formerly the HSOC] | DHS | |
| NOC | Navy Operations Center | FEMA | |
| NOC | Negotiations Operations Center | FEMA | |
| NOC | Network Operations Center | FEMA | |
| NOC-HQE | National Operations Center - Headquarters Element | FEMA | |
| NOEL | No Observed Effects Level | FEMA | |
| NOFA | Notice of Funds Availability | FEMA | |
| NOFD | New Orleans Fire Department | FEMA | |
| NOGA | Notice of Grant Award | FEMA | |
| NOI | Notice of Intent | FEMA | |
| NOI | Notice of Interest | FEMA | |
| NOID | Notice of Intent to Deny | USCIS | |
| NOK | Next of Kin | FEMA | |
| NOPD | New Orleans Police Department | FEMA | |
| NOPR | Notice of Proposed Rulemaking | FEMA | |
| NORAD | North American Aerospace Defense Command | CWMD | |
| NORTHCOM | United States Northern Command | FEMA | USCG | |
| NOS | National Ocean Survey | FEMA | |
| NOS | Not Otherwise Specified | FEMA | |
| NOSAC | National Offshore Safety Advisory Committee | USCG | |
| NOTAM | Notice to Airmen | FEMA | |
| NOUE | Notice of Unusual Event | FEMA | |
| NP | National Preparedness (FEMA/NP) | DHS | |
| NP | Navigation Processor | FEMA | |
| NPBF | non-petroleum based fuel | DHS | |
| NPC | National Paralympic Committee | FEMA | |
| NPC | National Petroleum Council | FEMA | |
| NPD | National Preparedness Directorate | FEMA | |
| NPDES | National Pollutant Discharge Elimination System | FEMA | |
| NPDP | National Performance of Dams Program | FEMA | |
| NPES | National Planning and Execution System | OPS | |
| NPFC | National Pollution Funds Center | FEMA | |
| NPG | National Preparedness Goal | FEMA | |
| NPG | National Preparedness Guidelines | FEMA | |
| NPL | National Priorities List | FEMA | |
| NPLA | National Preparedness Leadership Academy | FEMA | |
| NPM | National Preparedness Month | FEMA | |
| NPMA | National Property Management Association | FEMA | |
| NPMOC | Naval Pacific Meteorology and Oceanography Center | FEMA | |
| NPOC | Next Port of Call | CBP | USCG | |
| NPOESS | National Polar-Orbiting Operational Environmental Satellite System | FEMA | |
| NPP | Nuclear Power Plant | FEMA | |
| NPPC | National Preparedness and Prevention Council | FEMA | |
| NPPD | National Protection and Programs Directorate (see CISA) | DHS | |
| NPR | National Partnership for Reinventing Government (formerly National Performance Review) | FEMA | |
| NPR | National Preparedness Report | FEMA | |
| NPR | Nationwide Plan Review | FEMA | |
| NPRA | National Petrochemical & Refiners Association | PLCY | |
| NPRM | Notice of Proposed Rulemaking [see also ANPRM and SNPRM] | TSA | OGC | |
| NPRT | National Pharmacist Response Team | FEMA | |
| NPS | National Park Service | FEMA | |
| NPS | National Pharmaceutical Stockpile | FEMA | |
| NPS | National Planning Scenarios | FEMA | |
| NPS | National Preparedness System | FEMA | |
| NPS | Naval Postgraduate School | FEMA | |
| NPSC | National Processing Service Center | FEMA | |
| NPSP | National Pharmaceutical Stockpile Program | FEMA | |
| NPSTC | National Public Safety Telecommunications Council | FEMA | S&T | |
| NRAT | National Radiological Advisory Team | FEMA | S&T | CWMD | |
| NRAT | Nuclear Radiological Advisory Team | FEMA | |
| NRC | National Records Center | ICE | |
| NRC | National Research Council | FEMA | |
| NRC | National Response Center | FEMA | |
| NRC | Nuclear Regulatory Commission | DHS | |
| NRCC | National Response Coordination Center | FEMA | |
| NRCC | Northern Regional Coordination Center | FEMA | |
| NRCOC | Nuclear Regulatory Commission Operations Center | FEMA | |
| NRCS | Natural Resources Conservation Service | FEMA | |
| NRCSDC | Natural Resources Conservation Service District Conservationist | FEMA | |
| NRCSSC | Natural Resources Conservation Service State Conservationist | FEMA | |
| NRF | National Response Framework [supersedes NRP] | FEMA | |
| NRIA | Nuclear/Radiological Incident Annex (to the NRF) | FEMA | |
| NRIMC | National Resources Information and Mapping Center | FEMA | |
| NRIS | National Resource Information System | FEMA | |
| NRO | National Reconnaissance Office | FEMA | |
| NRP | National Response Plan (see NRF) | FEMA | |
| NRPC | National Railway Passenger Commission | TSA | |
| NRP-CIS | National Response Plan Catastrophic Incident Supplement | FEMA | |
| NRR | Noise Reduction Rating | FEMA | |
| NRS | National Response System | FEMA | |
| NRT | National Response Team | FEMA | |
| NRT | Near Real-Time | FEMA | |
| NRWA | National Rural Water Association | FEMA | |
| NS | National Strategic (Task) | FEMA | |
| NS/EP | National Security and Emergency Preparedness | FEMA | |
| NS/EPC | National Security and Emergency Preparedness Communications, Committee for | FEMA | |
| NSA | National Sheriffs Association | CISA | |
| NSA | National Security Agency | DHS | |
| NSA | National Security Area | FEMA | |
| NSA | Network Security Agreement | DHS | |
| NSABB | National Science Advisory Board for Biosecurity | S&T | |
| NSAC | Navigation Safety Advisory Council | USCG | |
| NSAT | Network Service Acceptance Test | FEMA | |
| NSBC | National Safe Boating Council | USCG | |
| NSC | National Security Cutter | USCG | |
| NSC | National Safety Council | FEMA | |
| NSC | National Security Council | DHS | |
| NSC | NFIRS Support Center | FEMA | |
| NSD | Named Storm Day | FEMA | |
| NSD | National Security Directive | FEMA | |
| NSDD | National Security Decision Directive | FEMA | |
| NSDI | National Spatial Data Infrastructure | I&A | |
| NSEC | National Security Emergency Coordination | FEMA | |
| NSEC | National Standard Exercise Curriculum | FEMA | |
| NSEERS | National Security Entry Exit Registration System | DHS | CBP | CRCL | I&A | |
| NSEPT | National Security and Emergency Preparedness Telecommunications | FEMA | |
| NSF | National Science Foundation | FEMA | S&T | |
| NSF | National Strike Force | FEMA | |
| NSFCC | National Strike Force Coordination Center | FEMA | |
| NSGIC | National States Geographic Information Council | FEMA | |
| NSGP | Non-Profit Security Grant Program | FEMA | |
| NSHS | National Strategy for Homeland Security | CISA | |
| NSI | National Security Information | FEMA | |
| NSI | Nuclear Surety Inspection | FEMA | |
| NSLRSDA | National Satellite Land Remote Sensing Data Archive | FEMA | |
| NSMP | National Strong-Motion Program | FEMA | |
| NSN | National Security Notifications | FEMA | |
| NSN | National Stock Number | FEMA | |
| NSPD | National Security Presidential Directive | DHS | |
| NSPE | National Society of Professional Engineers | FEMA | |
| NSPS | National Security Personnel System | OGC | |
| NSRS | National Spatial Reference System | FEMA | |
| NSRV | National Security and Records Verification (USCIS/NSRV) | DHS | |
| NSS | National Security Strategy | CISA | |
| NSS | National Shelter System | FEMA | |
| NSSA | National Safe Skies Alliance | TSA | |
| NSSDA | National Standard for Spatial Data Accuracy | FEMA | |
| NSSE | National Special Security Event | USSS | CISA | S&T | |
| NSSFC | National Severe Storms Forecast Center | FEMA | |
| NSSL | National Severe Storms Laboratory | FEMA | |
| NSTAC | National Security Telecommunications Advisory Committee | CISA | PLCY | |
| NSTC | National Science & Technology Council | S&T | |
| NSTR | Nothing Significant to Report | FEMA | |
| NT | Network Technology | FEMA | |
| NT | Windows NT operating system | FEMA | |
| NTA | National Technology Alliance | S&T | |
| NTA | Network Technology Architecture | FEMA | |
| NTA | Notice to Appear | ICE | USCIS | |
| NTAC | National Threat Assessment Center | USSS | I&A | |
| NTAS | National Terrorism Advisory System | I&A | |
| NTC | National Targeting Center | CBP | I&A | |
| NTC | National Teleregistration Center | FEMA | |
| NTC-MW | National Teleregistration Center at Mount Weather | FEMA | |
| NTE | Not to Exceed | FEMA | |
| NTEU | National Treasury Employees Union | MGMT | OGC | |
| NTFI | National Task Force on Interoperability | FEMA | |
| NTIA | National Telecommunications and Information Administration | FEMA | PRIV | |
| NTIS | National Technical Information Service | FEMA | |
| NTM | National Technical Means | FEMA | |
| NTMR | National Technical Means of Reconnaissance | FEMA | |
| NTMS | National Telecommunications Management Structure | FEMA | |
| NTNFC | National Technical Nuclear Forensics Center | CWMD | |
| NTR | Nothing to Report | FEMA | |
| N-TRAP | National Terrorism Response Awareness Program | FEMA | |
| NTRO | National Terrorism Response Objective | FEMA | |
| NTS | National Traffic System | FEMA | |
| NTS | Nevada Test Site | FEMA | |
| NTSB | National Transportation Safety Board | DHS | |
| NTSC | National Telecommunications Standards Committee | FEMA | |
| NTSP | National Telecommunications Support Plan; a.k.a. National Plan for Telecommunications Support in Non-Wartime Emergencies | FEMA | |
| NTSRA | National Transportation Sector Risk Assessment | TSA | CISA | |
| NTVRP | Non-Tank Vessel Response Plan | USCG | |
| NU | Name Unknown | FEMA | |
| NUCFLASH | Accidental, unauthorized, or unexplained nuclear detonation | FEMA | |
| NUDET | Nuclear Detonation | FEMA | |
| NUL | National Urban League | CISA | |
| NUMARC | Nuclear Management and Resources Council | FEMA | |
| NUREG | Nuclear Regulation | FEMA | |
| NUSRS | National Urban Search and Rescue System, Advisory Committee of the | FEMA | |
| NUWAX | Nuclear Weapon Exercise | FEMA | |
| NUWC | Naval Undersea Warfare Center | FEMA | |
| NVAC | National Visualization and Analytics Center | FEMA | |
| NVC | National Visa Center | FEMA | |
| NVDC | National Vessel Documentation Center | FEMA | |
| NVFC | National Volunteer Fire Council | FEMA | USFA | |
| NVG | Night Vision Goggles | CBP | ICE | |
| NVIC | Navigation and Vessel Inspection Circular | USCG | |
| NVL | Night Vision Laboratory | USSS | |
| NVLAP | National Voluntary Laboratory Accreditation Program | FEMA | |
| NVMC | National Vessel Movement Center | USCG | I&A | |
| NVOAD | National Voluntary Organizations Active in Disasters | FEMA | |
| NVPS | National Virtual Pointer System | I&A | |
| NVTSA | Night Vision Technology Safety Act | S&T | |
| NW | Neighborhood Watch | FEMA | |
| NWARSG | Nuclear Weapons Accident Response Steering Group | FEMA | |
| NWC | National Warning Center | FEMA | |
| NWCG | National Wildfire Coordinating Group | FEMA | |
| NWCG | National Wildland Coordinating Group | FEMA | |
| NWP | Neighborhood Watch Program (see NW) | FEMA | |
| NWR | National Weather Radio | FEMA | |
| NWR | NOAA Weather Radio | FEMA | |
| NWS | National Weather Service | FEMA | CISA | |
| NWSFO | National Weather Service Forecast Office | FEMA | |
| NWWS | National Weather Wire Service | FEMA | |
| NYCOEM | New York City Office of Emergency Management | FEMA | |
| O number | Order number | FEMA | |
| O&M | Operations and Maintenance | FEMA | |
| O/C | Observer/Controller | FEMA | |
| OA | Office Automation | FEMA | |
| OA | Over and Above | FEMA | |
| OA | operational assessment | S&T | |
| OAA | Older Americans Act | FEMA | |
| OAD | Operations Analysis Division (S&T/OAD) | DHS | |
| OADR | Originating Agency Determination Required | FEMA | |
| OAFME | Office of the Armed Forces Medical Examiner | FEMA | |
| OAM | Office of Acquisition Management | FEMA | |
| OAO | Office of Aviation Operations | TSA | |
| OAR | Office of Air and Radiation | FEMA | |
| OAR | Office of Oceanic and Atmospheric Research | FEMA | |
| OAS | Office of Administrative Support | FEMA | |
| OAS | Office of Aircraft Services | FEMA | |
| OAS | Organization of American States | FEMA | PLCY | |
| OASD | Office of the Assistant Secretary of Defense | FEMA | |
| OASH/OEP | Office of the Assistant Secretary for Health / Office of Emergency Preparedness | FEMA | |
| OASIS | Organization for the Advancement of Structured Information Standards | I&A | |
| OAST | Office of Accessible Systems & Technology | FEMA | |
| OAWG | Organizational Attack Working Group | TSA | |
| OB | Official Business | FEMA | |
| OBE | Overcome by Events | FEMA | |
| OBP | Border Patrol, Office of (CBP/OBP) | DHS | |
| OBS | Observation | FEMA | |
| OC | Operations Center | FEMA | |
| OCA | Office of Congressional Affairs | FEMA | |
| OCA | Original Classification Authority | FEMA | |
| OCAO | Office of the Chief Administrative Officer (MGMT/OCAO) | DHS | |
| OCB | Operations Centers Branch | FEMA | |
| OCC | Office of the Chief Counsel | FEMA | |
| OCC | Office of the Controller of Currency | FEMA | CISA | |
| OCD | Office of Community Development | FEMA | |
| OCDETF | Organized Crime Drug Enforcement Task Force | ICE | USCG | |
| OCFO | Office of the Chief Financial Officer (MGMT/OCFO) | DHS | |
| OCFOAS | Office of Chief Financial Officers & Administrative Services | FEMA | |
| OCG | Operations Coordinating Grouo | OPS | |
| OCGFC | Office of Cerro Grande Fire Claims | FEMA | |
| OCHAMPUS | Office of Civilian Health and Medical Program of the Uniformed Services | FEMA | |
| OCHCO | Office of the Chief Human Capital Officer (MGMT/OCHCO) | DHS | |
| OCIO | Office of the Chief Information Officer (MGMT/OCIO) | DHS | |
| OCIPEP | Office of Critical Infrastructure Protection and Emergency Preparedness | CISA | |
| OCJCS | Office of the Chairman of the Joint Chiefs of Staff | FEMA | |
| OCLA | Office of Congressional Liaison and Affairs | FEMA | |
| OCLUS | Outside the Continental Limits of the United States | FEMA | |
| OCN | Optimal Climate Normals | FEMA | |
| OCOG | Organizing Committee for the Olympic Games | FEMA | |
| OCONUS | Outside the Continental United States | FEMA | |
| OCPM | Office of Crisis Planning and Management | FEMA | |
| OCPO | Office of the Chief Procurement Officer (MGMT/CPO) | DHS | |
| OCR | Office of Collateral Responsibility | FEMA | |
| OCR | Optical Character Reader | FEMA | |
| OCR | Optical Character Recognition | FEMA | |
| OCRWM | Office of Civilian Radioactive Waste Management | FEMA | |
| OCS | Officer Candidate School | USCG | |
| OCS | Outer Continental Shelf | FEMA | |
| OCSO | Office of the Chief Security Officer (MGMT/OCSO) | DHS | |
| OCSP | Online Certificate Status Protocol | FEMA | |
| OCTAVE | Operationally Critical Threat, Asset, and Vulnerability Evaluation | CISA | |
| OCTEL | Operations Center Telephone | FEMA | |
| OCZM | Office of Coastal Zone Management | FEMA | |
| ODAM | Offsite Dose Assessment Manual | FEMA | |
| ODBC | Open Database Connectivity | FEMA | |
| ODC | Other Direct Cost | FEMA | |
| ODCEM | Oklahoma Department of Civil Emergency Management | FEMA | |
| ODEM | Oklahoma Department of Emergency Management | FEMA | |
| ODIS | Offshore Detection Integrated System | CWMD | |
| ODNI | Office of the Director of National Intelligence | FEMA | |
| ODP | Office for Domestic Preparedness | FEMA | CISA | |
| ODRO | Office of Detention and Removal Operations | ICE | |
| ODS | Operation Desert Safeguard | CBP | |
| OE | Operating Expenses | FEMA | |
| OE | Operational Environment | FEMA | |
| OE | Organizational Elements | FEMA | |
| OEC | Office of Emergency Communications | FEMA | |
| OECD | Organization for Economic Cooperation & Development | USSS | |
| OEM | Office of Emergency Management | FEMA | |
| OEM | Original Equipment Manufacturers | FEMA | |
| OEMA | Ohio Emergency Management Agency | FEMA | |
| OEMC | Office of Emergency Management and Communications | FEMA | |
| OEMP | Office of Emergency Medical Preparedness | FEMA | |
| OEP | Occupant Emergency Plan | FEMA | |
| OEP | Occupant Emergency Program | FEMA | |
| OEP | Office of Emergency Preparedness | FEMA | |
| OER | Office of Emergency Response | FEMA | |
| OER | Office of Equal Rights | FEMA | |
| OES | Office of Emergency Services | FEMA | |
| OET | Office of Emergency Transportation (DOT) | FEMA | |
| OF | Office of Finance | FEMA | |
| OF | Over-water Fetch (Line) | FEMA | |
| OFA | Office of Family Assistance | FEMA | |
| OFA | Other Federal Agency | FEMA | |
| OFAC | Office of Foreign Assets Control | CBP | |
| OFCR | Officer | FEMA | |
| OFDA | Office of Foreign Disaster Assistance | FEMA | |
| OFF | Offshore Forecast | FEMA | |
| OFM | Office of Financial Management | FEMA | |
| OFMA | Oklahoma Floodplain Management Association | FEMA | |
| OFO | Field Operations, Office of (CBP/OFO) | DHS | |
| OFP | Office of Field Programs | FEMA | |
| OFSEP | Office of Food Security and Emergency Preparedness | FEMA | |
| OGAT | Official Government Acceptance Test | FEMA | |
| OGC | Office of the General Counsel | DHS | |
| OGE | Office of Government Ethics | FEMA | |
| OGO | Office of Grant Operations | FEMA | |
| OGSA | Open Grid Services Architecture | FEMA | |
| OH | Occupational Health | FEMA | |
| OH | Overhead | FEMA | |
| OHA | Office of Health Affairs (see CWMD) | DHS | |
| OHR | Office of Human Resources | FEMA | |
| OHRM | Office of Human Resources Management | FEMA | |
| OHRP | Office for Human Research Protections [United States Dept. of Health and Human Services] (MD 10300) | FEMA | |
| OHS | Office of Homeland Security (see HSC) | FEMA | |
| OI | Office of Investigations | FEMA | |
| OIA | International Affairs, Office of (ICE/OIA), (PLCY/OIA) | DHS | |
| OIC | Office of Interoperability & Compatibility | S&T | |
| OIC | Officer-in-Charge | FEMA | USCG | |
| OIE | Office of International Enforcement | ICE | USCG | USCIS | USSS | I&A | |
| OIG | Office of Inspector General | DHS | |
| OIM | Office of Incident Management | FEMA | S&T | |
| OIRA | Office of Information and Regulatory Affairs | MGMT | PRIV | |
| OIS | Immigration Statistics, Office of (PLCY/OIS) | DHS | |
| OIT | Office of Information Technology | FEMA | |
| OIWG | Operational Intelligence Working Group | I&A | |
| OJCS | Office of the Joint Chiefs of Staff | FEMA | |
| OJP | Office of Justice Programs | FEMA | |
| OJT | On the Job Training | FEMA | MGMT | OPA | |
| OJT - formal | on-the-job training, (formal) OJT | MGMT | |
| OJT - unstructured | on-the-job training, unstructured OJT | MGMT | |
| OKC | Oklahoma City | FEMA | |
| OLA | Office of Legislative Affairs | DHS | |
| OLAP | On-Line Analytical Processing | FEMA | |
| OLAW | Office of Laboratory Animal Welfare | S&T | |
| OLC | Office of Legal Counsel | FEMA | |
| OLE | Object Linking and Embedding | FEMA | |
| OLE | Office of Law Enforcement | FEMA | |
| OLE/FAMS | Law Enforcement, Office of/Federal Air Marshal Service (TSA/OLE/FAMS) | DHS | |
| OLES | Office of Law Enforcement Standards | FEMA | |
| OLS | Operation Life Safety (see RFSI) | FEMA | |
| OLTP | On-Line Transaction Processing | FEMA | |
| OMA | Operations, Management, and Administration | FEMA | |
| OMB | Office of Management and Budget | DHS | |
| OMNCS | Office of the Manager, National Communications System | FEMA | |
| OMS | Operations Management Systems | FEMA | |
| OMTPE | Office of Mission to Planet Earth | FEMA | |
| ONA | Other Needs Assistance (IHP) | FEMA | |
| ONCRC | Office of National Capital Region Coordination | FEMA | |
| ONDCP | Office of National Drug Control Policy | DHS | |
| ONRA | Office of National Risk Assessment | TSA | |
| ONS | operational needs statement | S&T | |
| OOC | Office of Citizenship | USCIS | |
| OPA | Office of Public Affairs | DHS | |
| OPA | Otherwise Protected Area | FEMA | |
| OPA | Office of Public Affairs | OPA | |
| OPAC | On-Line Payments and Collection | FEMA | |
| OPBD | Operations Branch Director | FEMA | |
| OPC | Organizational Program Coordinators | FEMA | |
| OPCOM | Operational Command | FEMA | |
| OPCON | Operational Control | FEMA | |
| OPD | Office of Policy Development | FEMA | |
| OPDAT | Overseas Prosecutorial Development, Assistance and Training | FLETC | |
| OPEN | Open Platform for Emergency Networks | FEMA | |
| OPERIOD | Operational Period | FEMA | |
| OPF | Official Personnel Folder | MGMT | |
| OPHEP | Office of Public Health Emergency Preparedness (HHS) | FEMA | |
| OPHS | Office of Public Health and Science | FEMA | |
| OPLAN | Operations Plan | FEMA | |
| OPM | Office of Personnel Management | DHS | |
| OPO | Protective Operations (USSS/OPO) | DHS | |
| OPORD | Operation Order | FEMA | |
| OPPRED | Operation Predator | ICE | |
| OPR | Office of Primary Responsibility | FEMA | |
| OPR | Protective Research, Office of (USSS/OPR) | DHS | |
| OPREP | Operational Report | FEMA | |
| OPS | Office of Operations Coordination | MGMT | |
| OPS | Office of Operations Coordination and Planning | DHS | |
| OPS | Office of Pipeline Safety | FEMA | |
| OPS | Operational Planning System | FEMA | |
| OPS | Operations | DHS | |
| OPS (former) | Office of Private Sector Liaison (formerly PSL; see PSO) | FEMA | |
| OPSEC | Operations Security | DHS | |
| OPSG | Operation Stonegarden | FEMA | |
| OPSUM | Operations Summary | OPS | |
| OPT | Operations and Planning Team | FEMA | |
| OPTEMPO | Operating Tempo | FEMA | |
| OPUS | Olympic Properties of the United States | FEMA | |
| OPVAL | Operational Validation Program | FEMA | |
| OPW | Operational Planning Worksheet | FEMA | |
| OR&R | Office of Regulations and Rulings | FEMA | |
| ORA | Outstanding Research Award | FEMA | |
| ORCA | Operational Readiness Capability Assessment | FEMA | |
| ORD | Office of Research and Development | FEMA | |
| ORD | Office of the Regional Director | FEMA | |
| ORD | Operational Requirements Document | FEMA | |
| ORDM | Ordering Manager | FEMA | |
| OREMS | Oak Ridge Evacuation Modeling System | FEMA | |
| ORIA | Office of Radiation and Indoor Air | CWMD | |
| ORISE | Oak Ridge Institute for Science and Education | S&T | |
| ORM | Other Regulated Materials | FEMA | |
| ORNL | Oak Ridge National Laboratory | CWMD | |
| ORO | Off-site Response Organization | FEMA | |
| ORPA | Orthophoto Analyst | FEMA | |
| ORR | Office of Refugee Resettlement | FEMA | |
| ORTA | Office of Research and Technology Applications | MGMT | |
| OS | Operating System | FEMA | |
| OS | Operations Support | FEMA | |
| OS&Y | Outside Stem and Yoke | FEMA | |
| OSA | Operational Staging Area | FEMA | |
| OSAI | Office of SAFETY Act Implementation | FEMA | |
| OSARP | On-Screen Alarm Resolution Protocol | TSA | |
| OSC | Operations Systems Center | USCG | |
| OSC | Office of Special Counsel | FEMA | |
| OSC | On-Scene Commander | FEMA | |
| OSC | On-Scene Coordinator | FEMA | |
| OSC | Operation Safe Commerce | CBP | |
| OSC | Operational Support Center | FEMA | |
| OSC | Operations Support Center | FEMA | |
| OSC1 | Operations Section Chief 1 | FEMA | |
| OSC2 | Operations Section Chief 2 | FEMA | |
| OSCE | Organization for Security and Cooperation in Europe | PLCY | |
| OSD | ozone-depleting substance | DHS | |
| OSD | Operational Systems Document | FEMA | |
| OSD | Operations Support Division | FEMA | |
| OSD | Office of the Secretary of Defense (Public Affairs) | DHS | |
| OSDBU | Office of Small and Disadvantaged Business Utilization | MGMT | |
| OSD-HD | Office of the Secretary of Defense for Homeland Defense | FEMA | |
| OSEP | Office of Safety and Environmental Programs | MGMT | |
| OSEP | Occupational Safety and Environmental Programs (DHS) | FEMA | |
| OSHA | Occupational Safety and Health Administration | FEMA | |
| OSHE | Occupational Safety, Health and Environment | FEMA | |
| OSI | Open Systems Interconnect | FEMA | |
| OSIH | Occupational Safety and Industrial Hygiene | FEMA | |
| OSINT | Open-Source Intelligence | FEMA | |
| OSIR | open source information report | I&A | |
| OSLGC&P | Office of State and Local Government Coordination and Preparedness | FEMA | |
| OSLTF | Oil Spill Liability Trust Fund | FEMA | |
| OSM | Office of Surface Mining | FEMA | |
| OSO | Security Operations, Office of (TSA/OSO) | DHS | |
| OSOCC | On-Site Operations Coordination Center | FEMA | |
| OSP | Strategic Plans, Office of (PLCY/OSP) | DHS | |
| OSPF | Open Shortest Path First | FEMA | |
| OSS | Officer Safety and Survival Training Program | FLETC | |
| OST | Office of the Secretary for Transportation | FEMA | |
| OST | Operation Support Team | FEMA | |
| OSTC | On-Scene Tactical Commander | FEMA | |
| OSTP | Office of Science and Technology Policy | FEMA | |
| OT | International Trade, Office of (CBP/OT) | DHS | |
| OT | operational test | S&T | |
| OT&E | operational test and evaluation | S&T | |
| OTA | operational test agent | MGMT | |
| OTAN | Organisation du Traité de l'Atlantlique Nord (NATO) | FEMA | |
| OTAR | Over the Air Rekeying | FEMA | |
| OTBE | Overtaken by events | DHS | |
| OTD | Office of Training & Development | FEMA | |
| OTE | Operational Test & Evaluation | TSA | I&A | |
| OTH | Over the Horizon | USCG | |
| OTR | Office of Trade Relations | CBP | |
| OTRR | operational test readiness review | MGMT | |
| OTRS | Official Time Reporting System | FEMA | |
| OTS | Office of Thrift Supervision | FEMA | |
| OTS analysis | off-the-shelf analysis | MGMT | |
| OTSP | Office of Transportation Security Policy | TSA | |
| OTVP | Office of Transportation Vetting and Credentialing | TSA | I&A | PLCY | PRIV | |
| OUS | Office of the Undersecretary | FEMA | |
| OVC | Office for Victims of Crime | FEMA | |
| OVI | Office of Volunteerism Initiatives | FEMA | |
| OVP | Office of the Vice President | DHS | |
| OWMD | Office of Weapons of Mass Destruction | S&T | |
| P&A | Planning and Assessment | FEMA | |
| P&A | Price and Availability | FEMA | |
| P&D | Production and Development | FEMA | |
| P&I | Protection and Indemnity | FEMA | |
| P2 | pollution prevention | DHS | |
| P2P | Peer-to-Peer | FEMA | |
| PA | performance analysis | MGMT | |
| PA | Physician Assistant | FEMA | |
| PA | Principal Advisor | FEMA | |
| PA | Programmatic Agreement | FEMA | |
| PA | Public Address | FEMA | |
| PA | Public Affairs | FEMA | |
| PA | Public Announcement | FEMA | |
| PA | Public Assistance | FEMA | |
| PA&E | Program Analysis and Evaluation | FEMA | |
| PA05 | Purchasing Agent, 5K | FEMA | |
| PA10 | Purchasing Agent, 10K | FEMA | |
| PA25 | Purchasing Agent, 25K | FEMA | |
| PA50 | Purchasing Agent, 50K | FEMA | |
| PABX | Private Automatic Branch Exchange | FEMA | |
| PAC | Political Action Committee | FEMA | |
| PAC | Primary Agency Committee | FEMA | |
| PAC | Public Assistance Coordinator | FEMA | |
| PACAREA | Pacific Area | USCG | |
| PACC | Patient Airlift Control Center | FEMA | |
| PACOM | United States Pacific Command | FEMA | USCG | |
| PACS | physical access control system | MGMT | |
| PAD | Protective Action Decision | FEMA | |
| PAD | Public Affairs Director | FEMA | |
| PADC | Patch Authentication and Dissemination Capability | FEMA | |
| PADRE | Protective Action Dosage Reduction Estimator | FEMA | |
| PAECE | Protective Action Evaluator for Chemical Emergencies | FEMA | |
| PAES | Private Aircraft Enforcement System | CBP | TSA | I&A | PLCY | PRIV | |
| PAG | Protective Action Guide | FEMA | |
| PAH | Poly-nuclear Aromatic Hydrocarbons | FEMA | |
| PAHO | Pan-American Health Organization | FEMA | |
| PAI | publicly available information | I&A | |
| PAL | Public Affairs Level | FEMA | |
| PALS | Portable Automated Lookout System | CBP | I&A | PLCY | PRIV | |
| PA-NST | Public Affairs - National Support Team | FEMA | |
| PANYNJ | Port Authority of New York and New Jersey | S&T | |
| PAO | Pacific Area Office | FEMA | |
| PAO | Public Affairs Officer | FEMA | OPA | |
| PAO | Public Assistance Officer | FEMA | |
| PAP | Project Application Processor | FEMA | |
| PAPD | Port Authority Police Department | USCG | S&T | |
| PAPOs | Preparedness Analysis and Planning Officers | FEMA | |
| PAPR | Powered Air Purifying Respirator | FEMA | |
| PAPRS | Phone Activated Paperless Request System | FEMA | |
| PA-PRT | Public Affairs - Planning Response Team | FEMA | |
| PAR | Performance & Accountability Report | FEMA | |
| PAR | Personal/Personnel Accountability Record | FEMA | |
| PAR | Population at Risk | FEMA | |
| PAR | Protective Action Recommendation | FEMA | |
| PAR | Public Administration Review | FEMA | |
| PARADE | Prevention, Advocacy, Resources and Data Exchange | CISA | |
| PARDOS | Partial Dosage | FEMA | |
| PART | Program Assessment Rating Tool | I&A | |
| PAS | Presidential Appointment with Senate Confirmation | DHS | MGMT | |
| PAs | Protective Actions | FEMA | |
| PASP | Protective Action Strategy Plan | FEMA | |
| PASS | Performance Accountability and Standards System | TSA | |
| PASS | Personnel Alert Safety System | FEMA | |
| PAT | Process Action Team | FEMA | |
| PATCO | Professional, Administrative, Technical, Clerical, Other | FEMA | |
| PATF | Practical Applications Training Facility | FLETC | |
| PATRIOT | (see USA PATRIOT [Act]) | OGC | |
| PAWSA | Ports and Waterways Safety Assessment | USCG | CISA | |
| PAWSS | ports and waterways safety system | PLCY | |
| PAX | Passengers | FEMA | |
| PAZ | Protective Action Zone | FEMA | |
| PBA | Pine Bluff Arsenal | FEMA | |
| PBAC | Policy Based Access Control | FEMA | |
| PBCA | Pine Bluff Chemical Activity | FEMA | |
| PBD | Program Budget Decision | FEMA | |
| PBDS | Prototype Biological Detection System | FEMA | |
| PBIED | person-borne improvised explosive device | S&T | |
| PBL | performance based logistics | MGMT | |
| PBOP | Probeye Operator | FEMA | |
| PBR | Program and Budget Review | MGMT | |
| PBR guidance | program and budget review guidance | MGMT | |
| PBRB | Program Budget Review Board | FEMA | |
| PBS | Public Broadcasting System | FEMA | |
| PBS | Public Buildings Service | FEMA | |
| PBSIS | Public Building Service Information System | FEMA | |
| PBX | Phone (or Private) Bank Exchange | FEMA | |
| PBX | Private Branch Exchange | FEMA | |
| PC | Peace Corps | FEMA | |
| PC | Personal Computer | FEMA | |
| PCC | Pathobiologics Collaborating Center | FEMA | |
| PCC | Policy Coordination Committee | DHS | FEMA | I&A | PLCY | |
| PCCIP | President’s Commission on Critical Infrastructure Protection | FEMA | |
| PCE | Programmatic Categorical Exclusion | FEMA | |
| PCERT | Preliminary Computer Evidence Recovery Training | USSS | |
| PCF | Patient Care Form | FEMA | |
| PCII | Protected Critical Infrastructure Information | CISA | I&A | |
| PCIIMS | PCII Management System | CISA | |
| PCIS | Partnership for Critical Infrastructure Security | FEMA | |
| PCLOB | Privacy and Civil Liberties Oversight Board | CRCL | |
| PCO | Privy Council Office | FEMA | |
| PCPT | Pasco County Public Transportation (Florida) | FEMA | |
| PCQS | Person Centric Query Service | I&A | |
| PCR | privacy compliance review | MGMT | |
| PCR | polymerase chain reaction | FEMA | |
| PCR | Program and Capability Review | FEMA | |
| PCS | Permanent Change of Station | FEMA | |
| PCS | Personal Communications Service/System | FEMA | |
| PCS | Planning, Coordination and Support [Task] (National Preparedness Guidance) | FEMA | |
| PCSF | Process Control Systems Forum | FEMA | |
| PCT | Polk County Transit (Florida) | FEMA | |
| PCT | Program Control Team | FEMA | |
| PCTARE | Personal Computer Time and Attendance Remote Entry | FEMA | |
| PCWHF | Presidential Commission on White House Fellows | FEMA | |
| PD | Paid | FEMA | |
| PD | Per Diem | FEMA | |
| PD | Police Department | FEMA | |
| PD | Policy Directive | FEMA | |
| PD | Position Description | FEMA | |
| PD | Presidential Declaration | FEMA | |
| PDA | Personal Data Assistant | FEMA | |
| PDA | Preliminary Damage Assessment | FEMA | |
| PDA | Presbyterian Disaster Assistance | FEMA | |
| PDA | Pueblo Depot Activity | FEMA | |
| PDASH | Principal Deputy Assistant Secretary for Health | FEMA | |
| PDB | President's Daily Brief | FEMA | |
| PDC | Pacific Disaster Center | FEMA | |
| PDC | Personnel Data Card | FEMA | |
| PDCA | Plan, Do, Check, Adjust | FEMA | |
| PDD | Presidential Decision Directive | DHS | FEMA | I&A | |
| PDEV | Policy Development, Office of (PLCY/PDEV) | DHS | |
| PDF | Portable Document Format | FEMA | MGMT | OPA | |
| PDF | Probability Density Function | FEMA | |
| PDIM | Planning Development and Implementation Management | FEMA | |
| PDIM | Planning Development and Information Management | FEMA | |
| PDIM | Planning Document Imaging Management | FEMA | |
| PDIM | Postgraduate Diploma in Information Management | FEMA | |
| PDM | physical data model | MGMT | |
| PDM | Pre-disaster Mitigation | FEMA | |
| PDMF | Pre-disaster Mitigation Fund | FEMA | |
| PDO | Program Decision Option | FEMA | |
| PDOP | Position Dilution of Precision | FEMA | |
| PDP | Policy Decision Point | FEMA | |
| PDS | Personnel Decontamination Station | FEMA | |
| PDS | Practice Dangerous to Security | FEMA | |
| PDSI | Palmer Drought Severity Index | FEMA | |
| PDT | Pacific Daylight Time (GMT - 7) | FEMA | |
| PDUSIA | Principal Deputy Under Secretary for Intelligence and Analysis | I&A | |
| PE | Professional Engineer | FEMA | |
| PEA | Programmatic Environmental Assessment | FEMA | |
| PEAD | Presidential Emergency Action Document | FEMA | |
| PECC | Provincial Emergency Coordination Center | FEMA | |
| PED | Portable Electronic Device | FEMA | |
| PEDS | Portable Emergency Data System | FEMA | |
| PEG | Performance Evaluation Group | FEMA | |
| PEG | Performance Evaluation Guide | FEMA | |
| PEIS | Programmatic Environmental Impact Statement | FEMA | |
| PEL | permissible exposure limit [asbestos] | DHS | |
| PEL | Permissible Exposure Limit | FEMA | CWMD | |
| PEMA | Pennsylvania Emergency Management Agency | FEMA | |
| PEO | Public Education and Outreach | FEMA | |
| PEOC | President’s Emergency Operations Center | FEMA | |
| PEP | Prepositioned Equipment Program | FEMA | CISA | |
| PEP | Primary Entry Point | FEMA | |
| PEP | Professional Excellence Program | FEMA | |
| PEPAC | Primary Entry Point Advisory Committee | FEMA | |
| PERI | Public Entity Risk Institute | FEMA | |
| PERT | Program Evaluation and Review Technique | FEMA | |
| PES | Performance Excellence Series | FEMA | |
| PETL | Prevention Education Team Leader | FEMA | |
| PETM | Prevention Education Team Manager | FEMA | |
| PFA | Primary Federal Agency | FEMA | |
| PFA | Procurement Funding Authority | FEMA | |
| PFD | Primary Frontal Dune | FEMA | |
| PFO | Principal Federal Official/Officer | CISA | |
| PFOR | Principal Federal Official’s Representative | FEMA | |
| PFPA | Pentagon Force Protection Agency | FLETC | |
| PFT | Permanent Full-Time | FEMA | |
| PG | Planning Group | FEMA | |
| PGC | Privacy Guidelines Committee | FEMA | |
| PGM | Program | FEMA | |
| PGP | Pretty Good Privacy | FEMA | |
| PH | Public Health | FEMA | |
| PHEP | Public Health Emergency Preparedness | FEMA | |
| PHILIS | Portable High-Throughput Integrated Laboratory Identification System | S&T | |
| PHIN | Public Health Information Network | FEMA | |
| PHMSA | Pipeline and Hazardous Materials Safety Administration (within DOT) | FEMA | |
| PHRBAE | Public Health Readiness for Biological Agent Event | FEMA | |
| PHS | Public Health Service | FEMA | |
| PHS&T | packaging, handling, storage, and transportation | MGMT | |
| PI | performance improvement | MGMT | |
| PI | Pandemic Influenza | FEMA | |
| PI | Project Impact | FEMA | |
| PI | Project Inspector | FEMA | |
| PIA | partnership intermediary agreement | MGMT | |
| PIA | Privacy Impact Assessment | I&A | PRIV | |
| PIADC | Plum Island Animal Disease Center | S&T | |
| PIAT | Public Information Assist Team | FEMA | |
| PIC | Pilot in Charge | FEMA | |
| PIC | Pressurized Ion Chamber | FEMA | |
| PIC | Prime Integration Contractor | FEMA | |
| PICCL | Private Sector Communications Coordination Line | FEMA | |
| PID | program identifier | MGMT | |
| PIER | Public Information, Education and Relations | FEMA | |
| PIF | Policies in Force | FEMA | |
| PIG | Public Interest Group | FEMA | |
| PII | Personally Identifiable Information | FEMA | |
| PIID | procurement instrument identifier | MGMT | |
| PIN | Personal Identification Number | DHS | |
| PINS | Personnel in Need of Supervision | FEMA | |
| PIO | Public Information Officer | FEMA | OPA | |
| PIO1 | Public Information Officer Type 1 | FEMA | |
| PIO2 | Public Information Officer Type 2 | FEMA | |
| PIOF | Public Information Officer | FEMA | |
| PIP | Proposer Information Pamphlet | FEMA | |
| PIPS | Pre-Incident Planning System | FEMA | |
| PIR | Post Implementation Review | FEMA | |
| PIR | Priority Intelligence Requirement | FEMA | |
| PIR | passive infrared switch | S&T | |
| PIV | Personal Identity Verification | MGMT | PLCY | PRIV | |
| PIV | personal identity verification card | MGMT | |
| PIV | Post Indicating Valve | FEMA | |
| PKEMRA | Post-Katrina Emergency Management Reform Act of 2006 | FEMA | |
| Pkg | Package | FEMA | |
| PKI | Public Key Infrastructure | FEMA | |
| PL | Padlock | FEMA | |
| PL | Preparedness Level | FEMA | |
| PL | Public Law (also abbreviated as P.L.) | FEMA | |
| PL 93-288 | Robert T. Stafford Disaster Relief and Emergency Assistance Act (as amended) | FEMA | |
| PLA | Principal Legal Advisor | ICE | |
| PLC | Pacific Logistics Center | FEMA | |
| PLCY | Office of Policy | DHS | |
| PLE | Principal Level Exercises | FEMA | |
| PLOTS | Passport Lookout Tracking System | CBP | I&A | PLCY | PRIV | |
| PLUMIS | (See PIADC [Plum Island]) | FEMA | |
| PLUMIS | See PIADC (Plum Island) | S&T | |
| PM | Project Manager | MGMT | |
| PM | Post Meridiem | FEMA | |
| PM | Postmaster | FEMA | |
| PM | Program Manager | FEMA | |
| PM | Project Monitor | FEMA | |
| PMA | President’s Management Agenda | FEMA | |
| PMCE | Positive Memorable Customer Experience | FEMA | |
| PMCS | Preventive Maintenance Checks and Services | FEMA | |
| PMEF | primary mission essential function | MGMT | |
| PMF | Presidential Management Fellows | FEMA | |
| PMG | Program Management Group | FEMA | |
| PMG | Program Monitoring Group | FEMA | |
| PMIS | Performance Measurement Information System | TSA | |
| PM-ISE | Program Manager for the Information Sharing Environment (Office of) | FEMA | |
| P-MNS | preliminary mission need statement | S&T | |
| PMO | Program Management Office | MGMT | |
| PMO | Property Management Officer | FEMA | |
| PMP | Performance Monitoring Plan | FEMA | |
| PMP | Project Management Professional | FEMA | |
| PMP | project management plan | S&T | |
| PMR | Patient Movement Request | FEMA | |
| PMR | Physical Map Revision | FEMA | |
| PMRS | Performance Management And Recognition System | FEMA | |
| PMS | Payments Management System | FEMA | |
| PMS | Program Management System | FEMA | |
| PMT | Project Management Team | FEMA | |
| PMTL | Protective Measures Target List | FEMA | |
| PMU | Property Management Unit | FEMA | |
| PMWG | Performance Management Working Group | FEMA | |
| PN | Part Number | FEMA | |
| PN | Project Number | FEMA | |
| PNE | Peaceful Nuclear Explosion | FEMA | |
| PNG | Portable Network Graphics | FEMA | |
| PNNL | Pacific Northwest National Laboratory | S&T | |
| PNOV | Preliminary Notice of Violation | FEMA | |
| PNP | Private Non-Profit | FEMA | |
| PNR | Passenger Name Record | TSA | |
| PNSP | Project on National Security Reform | FEMA | CISA | MGMT | |
| PNV | Present Net Value | FEMA | |
| PO | Personnel Office | FEMA | |
| PO | Post Office | FEMA | |
| PO | Preparedness Officer | FEMA | |
| PO | Privacy Office (see PRIV) | FEMA | |
| PO | Project Officer | FEMA | |
| PO | Purchase Officer | FEMA | |
| PO | Purchase Order | FEMA | |
| POA | Point of Arrival | FEMA | |
| POA&M | plan of action and milestones | MGMT | |
| POB | Place of Birth | FEMA | |
| POC | Point of Contact | DHS | |
| POD | Point of Departure | FEMA | |
| POD | Point of Distribution | FEMA | |
| PODS | Point of Distribution Sites | FEMA | |
| POE | Point of Entry | CBP | FEMA | USCG | |
| POE | Port of Entry | CBP | FEMA | USCG | |
| POES | Polar-Orbiting Environmental Satellite | FEMA | |
| POETE | Plan, Organize, Equip, Train, Exercise | FEMA | |
| POETE/OPS | Planning, Organization, Equipment, Training, Exercises, and Operations Support | FEMA | |
| POGO | Project on Government Waste | PRIV | |
| POI | Plan of Instruction | FEMA | |
| POI | Point of Instruction | FEMA | |
| POI | Program of Instruction | FEMA | |
| POL | Petroleum, Oil and Lubricants | FEMA | |
| POLF | Points of Light Foundation | FEMA | |
| POLREP | Pollution Report | FEMA | |
| POMSO | Plans, Operations, and Military Support Officer | FEMA | |
| POP | Period Of Performance | FEMA | |
| POP-3 | Post Office Protocol (Version 3) | FEMA | |
| POR | program of record | MGMT | |
| POR | Point of Review | FEMA | |
| POTS | Plain Old Telephone Service | FEMA | |
| POTUS | President of the United States | FEMA | |
| POTW | Public Owned Treatment Works | FEMA | |
| POV | Privately-owned Vehicle | FEMA | |
| PP | Pay Period | FEMA | |
| PP | Personal Property | FEMA | |
| PP | Personal Protection | FEMA | |
| PP5 | Pilot Program Airports (San Francisco, Kansas City, Rochester, Jackson Hole & Tupelo) | TSA | |
| PPA | program project activity | MGMT | |
| PPA | program project activity [financial] | MGMT | |
| PPA | Performance Partnership Agreement | FEMA | |
| PPACA | Performance Partnership Agreement Cooperative Agreement | FEMA | |
| PPAG | Proposed Public Affairs Guidance | FEMA | |
| PPB | Plans, Programs and Budget | S&T | |
| PPB | Parts Per Billion | FEMA | |
| PPBCP | Professional Practices for Business Continuity Professionals | FEMA | |
| PPBE | Planning, Programming, Budgeting and Execution | MGMT | |
| PPBES | Planning, Programming and Budgeting Execution System | FEMA | |
| PPBM | Positive Passenger Baggage Match | TSA | |
| PPBS | Planning, Programming and Budgeting System | I&A | |
| PPC | Prevention and Preparedness Council | FEMA | |
| PPCBP | Prickly Pear Cactus Burning Program | FEMA | |
| PPD | Preparedness Programs Division (PREP) | FEMA | |
| PPDS | Pre-Positioned Disaster Supplies | FEMA | |
| PPE | Pay Period Ending | FEMA | MGMT | OPA | |
| PPE | Personal Protective Equipment | FEMA | |
| PPFRP | Prepared and Perishable Food Rescue Program | FEMA | |
| PPG | Program Planning Guidance | FEMA | |
| PPI | Progressive Policy Institute | PRIV | |
| PPI | Port Partnership Initiative | CWMD | |
| PPM | Parts Per Million | FEMA | |
| PPM | Printer/Plotter Module | FEMA | |
| PPM | Program Performance Monitoring | FEMA | |
| PPN | Passport Number | CBP | USCG | |
| PPO | Preferred Provider Organizations | MGMT | |
| PPPA | Preparedness Policy, Planning, and Analysis (Office of) | FEMA | |
| PPQ | Plant Protection and Quarantine | CBP | |
| PPR | Plans, Programs, & Requirements (Office of) | FEMA | |
| PPR | Prior Permission Required | FEMA | |
| PPS | Pre-Positioned Site | FEMA | |
| PR | Positive Response (Exercise Series) | FEMA | |
| PR | Public Relations | FEMA | |
| PR | Purchase Request | FEMA | |
| PRA | Paperwork Reduction Act | FEMA | |
| PRA | Patient Reporting Activity | FEMA | |
| PRB | Performance Review Board | MGMT | |
| PRB | Procurement Review Board | FEMA | |
| PRC | Peoples Republic of China | PLCY | |
| PRC | Permanent Resident Card | CBP | USCIS | PLCY | |
| PRC | Presidential Reserve Call-up | FEMA | |
| PRC | Postal Rate Commission | DHS | |
| PRD | Personal Radiation Detection Device | CBP | |
| PREP | Preparedness [DHS Directorate for] (see NPPD) | FEMA | |
| PREPnet | National Preparedness Network | FEMA | |
| PRER | Peacetime Radiological Emergency Response | FEMA | |
| PRIME POWER | USACE Engineer Battalion | FEMA | |
| PRISM | Performance and Registration Information Systems Management | FEMA | |
| PRIV | Privacy Office | MGMT | |
| PRIV | Office of the Chief Privacy Officer | DHS | |
| PRND | Preventative Radiological and Nuclear Detection | CWMD | |
| PRNG | Puerto Rico National Guard | FEMA | |
| PRO | Personnel Records On-Line | FEMA | |
| PROACT | Protective and Response Options for Airport Counter Terrorism | FEMA | |
| PROC | Procurement Unit Leader | FEMA | |
| PROFLOW | Procedural Flow | DHS | |
| PROTECT | Program for Response Options and Technology Enhancements for Chemical/Biological Terrorism | FEMA | S&T | |
| PRP | potentially responsible party | DHS | |
| PRP | Personnel Reliability Program | FEMA | |
| PRP | Preferred Risk Policy | FEMA | |
| PRS | Primary Receiving Site | FEMA | |
| PRT | Planning and Response Team | FEMA | |
| PS | Program Support | FEMA | |
| PSA | Port Security Assessment | USCG | |
| PSA | Patient Staging Area | FEMA | |
| PSA | Protective Security Advisor | FEMA | |
| PSA | Public Service Announcement | FEMA | OPA | |
| PSAMS | Personnel Security Activity Management System | MGMT | |
| PSAPs | Public Safety Answering Points | FEMA | |
| PSAT | Protective Security Assistance Teams | CISA | |
| PSB | Planning Support Branch | FEMA | |
| PSC1 | Planning Section Chief Type 1 | FEMA | |
| PSC2 | Planning Section Chief Type 2 | FEMA | |
| PSCD | Protective Security Coordination Division | FEMA | |
| PSD | Protective Security Division | CISA | |
| PSD | Plastic Sphere Dispenser | FEMA | |
| PSE | private sector employer | MGMT | |
| PSEAG | Physical Security Equipment Action Group | FEMA | |
| PSGP | Port Security Grant Program | FEMA | USCG | |
| PSI | Pounds per square inch | FEMA | |
| PSI | Proliferation Security Initiative | CBP | |
| PSIA | Pounds per Square Inch Absolute | FEMA | |
| PSIC | Public Safety Interoperable Communications | FEMA | CISA | |
| PSIG | Pounds per Square Inch Gauge | FEMA | |
| PSL (see PSO) | Formerly [Office of] Private Sector Liaison (PSO—in PLCY as of October 2005; see PSO) | FEMA | |
| PSMA | Pre-Scripted Mission Assignment | FEMA | |
| PSN | Public Switched Network | FEMA | |
| PSO | Protective Security Officer | MGMT | |
| PSO | Program Security Officer | MGMT | |
| PSO | Private Sector [Liaison] Office (PLCY/PSO) (former OPS, and PSL) | DHS | |
| PSOB | Public Safety Officer Benefits | FEMA | |
| PSOTP | Protective Security Operations Training Program | FLETC | |
| PSR | Personal Service Radio | FEMA | |
| PSR | Power Soft Report | FEMA | |
| PSRC | Presidential Selected Reserve Call-up | FEMA | |
| PSS | Physical Security Specialist | FEMA | |
| PST | Pacific Standard Time | DHS | |
| PSTA | Pinellas Suncoast Transit Authority (Florida) | FEMA | |
| PSTN | Public Switch Telephone Network | FEMA | |
| PSU | Port Security Unit | USCG | |
| PSWAC | Public Safety Wireless Advisory Committee | FEMA | |
| PSWN | Public Safety Wireless Network | FEMA | |
| PT | Part-Time | FEMA | |
| PT | Payload Transporter | FEMA | |
| PT&E | Preparedness, Training, and Exercises [Directorate] | FEMA | |
| PTA | Parent-Teachers Association | FEMA | |
| PTA | Privacy Threshold Analysis | FEMA | |
| PTB | Position Task Book | FEMA | |
| PTBS | Position Task Books | FEMA | |
| PTI | Positive Threat Identification | TSA | |
| PTO | Patent and Trademark Office | FEMA | |
| PTR | Pointer | FEMA | |
| PTR | Printer | FEMA | |
| PTR | Property Transfer Report | FEMA | |
| PTRC | Personnel Time Recorder | FEMA | |
| PTSD | Post-Traumatic Stress Disorder | FEMA | |
| PTWC | Pacific Tsunami Warning Center | FEMA | |
| PUCA | Pueblo Chemical Activity | FEMA | |
| PUCD | Pueblo Chemical Depot | FEMA | |
| PUD | Planned Unit Development | FEMA | |
| PUDA | Pueblo Depot Activity | FEMA | |
| PUP | Principal User Processor | FEMA | |
| PUREX | Plutonium Uranium Extraction | FEMA | |
| PVA | Port Vulnerability Assessment | USCG | |
| PVC | Permanent Virtual Circuits | FEMA | |
| PVCS | Polyton Version Configuration System | FEMA | |
| PVO | Private Voluntary Organization | FEMA | |
| PVO | Private Volunteer Organization | FEMA | |
| PVTSAC | Private Sector Senior Advisory Committee | PLCY | |
| PW | Project Worksheet | FEMA | |
| PW | Public Works | FEMA | |
| PWCS | Ports Waters & Coastal Security | FEMA | |
| PWD | Persons with Disabilities | FEMA | TSA | CRCL | |
| PWD | Password | FEMA | |
| PWG | Practitioners Working Group | FEMA | |
| PWR | Power | FEMA | |
| PWR | Pressurized Water Reactor | FEMA | |
| PWS | public water system | DHS | |
| PY | Past Year | FEMA | |
| PZ | Precautionary Zone | FEMA | |
| Q&A | Questions and answers | DHS | |
| Q3 | Quality Level 3; refers to a digital version of a Flood Insurance Rate Map (note: Q3 Data refers to the flood zone information represented on the map) | FEMA | |
| QA | Quality Assurance | FEMA | |
| QA/QC | Quality Assurance/Quality Control | FEMA | |
| QAPP | Quality Assurance Project Plan | FEMA | |
| QASP | quality assurance surveillance plan | MGMT | |
| QASP | Quality Assurance Plan | FEMA | |
| QBE | Query by Example | FEMA | |
| QBO | Quasi-Biennial Oscillation | FEMA | |
| QC | Quality Control | FEMA | |
| QD | Quantity/Distance | FEMA | |
| QFR | Questions for the Record | OGC | |
| QFR | Questions for Review | FEMA | |
| QOP | Quality of Protection | FEMA | |
| QOS | Quality of Service | FEMA | |
| QRB | Quality Review Board | FEMA | |
| QRC | Quick Reaction Checklist | FEMA | |
| QRP | Quick Response Program | FEMA | |
| QRS | Quick Response System | FEMA | |
| QRT | Quick Response Team | FEMA | |
| QRU | Quick Response Unit | FEMA | |
| QSI | Quality Step Increase | FEMA | |
| QT | Total Activity Released | FEMA | |
| QTF | Quantitative Temperature Forecast | FEMA | |
| QTY | Quantity | FEMA | |
| QUF6 | Uranium Hexafluoride Inventory | FEMA | |
| R | remotely driven conveyance | S&T | |
| R | Roentgen | FEMA | |
| R&D | Research and Development | DHS | |
| R&R | Response & Recovery | FEMA | |
| R/h | Roentgens per hour | FEMA | |
| RA | Regional Administrator | FEMA | |
| RA | Reimbursable Agreement | FEMA | |
| RA | Resource Advisor | FEMA | |
| RA | Risk Assessment | FEMA | |
| RAA | Regional Airline Association | TSA | |
| RAA | Radiological Accident Assessment | FEMA | CWMD | |
| RAA | Request for Allocation Advice | FEMA | |
| RAAC | Radiological Accident Assessment Concepts | FEMA | |
| RAAW | Request for Allocation Advice Worksheet | FEMA | |
| RAC | Reception and Care | FEMA | |
| RAC | Regional Assistance Committee | FEMA | |
| RAC | Remedial Action Coordinator | FEMA | |
| RAC | Risk Assessment Code | FEMA | |
| RAC AC | Regional Assistance Committee Advisory Council | FEMA | |
| RACER™ | remedial action cost estimating requirement | DHS | |
| RACES | Radio Amateur Civil Emergency Services | FEMA | |
| RACF | Resource Access Control Facility | FEMA | |
| RAD | Radiation-Absorbed Dose | FEMA | CWMD | |
| RAD | Radiological | FEMA | S&T | CWMD | |
| RAD | Resource Allocation Decision | FEMA | |
| Rad/Nuc | Radiological/Nuclear | FEMA | |
| Rad/NUc CTEC | Radiological/Nuclear Countermeasures Test and Evaluation Complex | FEMA | |
| RADCON | Radiological Control (Team) | FEMA | |
| RADEF | Radiological Defense | FEMA | |
| RADIAC | Radioactivity Detection, Indication and Computation | FEMA | |
| RADID | Radar Information Display | FEMA | |
| RADLAB | Radiological Laboratory | FEMA | |
| RADNUC | Radiological/ Nuclear Enforcement | S&T | CWMD | |
| RADO | Radio Operator | FEMA | |
| RAFACS | Receipt and Alien File Accountability and Control System (see NFTS) | CBP | ICE | USCIS | I&A | PLCY | PRIV | |
| RAIC | Resident Agent in Charge | ICE | USSS | |
| RAID | Rapid Assessment and Initial Detection | FEMA | |
| RAID | Redundant Array of Independent Disks | FEMA | |
| RAIO | Refugee, Asylum & International Operations (USCIS/RAIO) | DHS | |
| RAM | Radiological/Radioactive Material | FEMA | |
| RAM | Random-Access Memory | FEMA | |
| RAM | Remedial Action Manager | FEMA | |
| RAMAC | Random Access Method Accounting Control | FEMA | |
| RAMCAP | Risk Analysis and Management for Critical Asset Protection | CISA | |
| RAM-D | Risk Assessment Methodology for Dams | FEMA | |
| RAMOS | Remote Automated Meteorological Observing System | FEMA | |
| RAMP | Ramp Manager | FEMA | |
| RAMP | Remedial Action Management Program | FEMA | |
| RAMPID | Remedial Action Management Program Issue Database | FEMA | |
| RAMPREP | Remedial Action Management Program Report | FEMA | |
| RAMT | Radiological Assessment Medical Team | FEMA | |
| RAMTAR | Radiological Material Transportation Accident Response | FEMA | |
| RAP | Risk Assessment Policy | MGMT | |
| RAP | Radiological Assistance Plan | FEMA | |
| RAP | Radiological Assistance Program | FEMA | |
| RAP | Remedial Action Project | FEMA | |
| RAP | Resource Allocation Plan | FEMA | |
| RAPID | Recovery Assistance Programs Information and Delivery | FEMA | |
| RAPID | Risk Assessment Process for Informed Decision Making | CISA | |
| RAPS | Refugees, Asylum and Parole System | USCIS | |
| RAPTAD | Random Particle Transport And Diffusion | FEMA | |
| RAR | Regional Analysis and Recommendation | FEMA | |
| RARE | Roadless Area Review and Evaluation | FEMA | |
| RART | Regional Assessment and Response Team | FEMA | |
| RASCAL | Radiological Assessment System for Consequence Analysis | FEMA | |
| RASO | Radiological Affairs Support Office (United States Navy) | FEMA | |
| RASS | Radio Acoustic Sounding System | FEMA | |
| RAT | Radiological Assistance Team | FEMA | |
| RAWG | Rapid Assessment Work Group | FEMA | |
| RAWN | Radar Wind Sounding | FEMA | |
| RAWS | Remote Automated Weather Station | FEMA | |
| RAWS | Remote Automated Weather System | FEMA | |
| RBAC | Role-Based Access Control | FEMA | |
| RBCS | Rural Business Cooperative Service | FEMA | |
| RC | custom radio controlled | S&T | |
| RC | Reception Center | FEMA | |
| RC | Recovery Center | FEMA | |
| RC | Red Cross (also ARC) | FEMA | |
| RC | Reserve Component | FEMA | |
| RC&D | Resource Conservation and Development | FEMA | |
| RCA | root cause analysis | MGMT | |
| RCA | Radiological Control Area | FEMA | |
| RCA | Riparian Conservation Area | FEMA | |
| RCA | Rural Community Assistance | FEMA | |
| RCAC | Red Cross Assistance Center | FEMA | |
| RCBAP | Residential Condominium Building Association Policy | FEMA | |
| RCC | Reception and Congregate Care | FEMA | |
| RCC | Regional Climate Center | FEMA | |
| RCC | Rescue Coordination Center | FEMA | USCG | |
| RCDCB | Regional Civil Defense Coordinating Board | FEMA | |
| RCDM | Receiving/Distribution Manager | FEMA | |
| RCF | Release Conversion Factor | FEMA | |
| RCIED | radio controlled improvised explosive device | S&T | |
| RCM | Radar-Coded Message | FEMA | |
| RCP | Regional Contingency Plan | FEMA | |
| RCP | Regional Oil and Hazardous Substances Pollution Contingency Plan | FEMA | |
| RCPG | Regional Catastrophic Preparedness Grant | FEMA | |
| RCPGP | Regional Catastrophic Preparedness Grant Program | FEMA | |
| RCRA | Resource Conservation and Recovery Act | FEMA | |
| RCS | Reactor Coolant System | FEMA | |
| RCS | Reports Control System | FEMA | (Video) 28 Must know Cyber Security Acronyms |
| RCT | Response Coordination Team | FEMA | |
| RCV | Replacement Cost Value | FEMA | |
| RD | I&A Regional Director | I&A | |
| RD | Regional Director | FEMA | |
| RD | Restricted Data | FEMA | |
| RDB | Resource Database | FEMA | |
| RDBMS | Relational Database Management System | I&A | MGMT | |
| RDC | Regional Disaster Coordinator | FEMA | |
| RDCD | Rapidly Deployable Chemical Detection | S&T | |
| RDD | radiological dispersal device | S&T | |
| RDD | Radiological Dispersion/Dispersal Device | FEMA | S&T | CWMD | |
| RDO | Radiological Defense Officer | FEMA | |
| RDO | Regional Disaster Office | FEMA | |
| RDO | Regional Duty Officer | FEMA | |
| RDO | Regular Day Off | FEMA | |
| RDOS | Real-Time Disk Operating System | FEMA | |
| RDP | Regional Delivery Program | FEMA | |
| RDPC | Rural Domestic Preparedness Consortium | FEMA | |
| RDS | Remote Delivery Site | FEMA | |
| RDT | Rapid Deployment Team | FEMA | |
| RDT&E | Research, Development, Testing and Evaluation | S&T | |
| RE | Real Estate | FEMA | |
| REA | Radioactive Emergency Area | FEMA | |
| REA | Rural Electrification Administration | FEMA | |
| REAC | Radiation or Radiological Emergency Assistance Center | FEMA | CWMD | |
| REAC/TS | Radiation Emergency Assistance Center - Training Site | FEMA | |
| REAC/TS | Radiological Emergency Assistance Center - Training Site | FEMA | |
| REACT | Radio Emergency Assistance Communications Team | FEMA | |
| REACT | Radio Emergency Associated Communications Team | FEMA | |
| READI | Response to Emergencies and Disasters Institute | FEMA | CISA | |
| REAL ID | Real Identification | PLCY | PRIV | |
| REC | record of environmental consideration | DHS | |
| REC | Regional Examination Center | USCG | |
| REC | Regional Emergency Coordinator | FEMA | |
| RECA | Residual Capability Assessment | FEMA | |
| RECAT | Residential Capability Assessment Team | FEMA | |
| RECC | Regional Emergency Communications Coordinator | FEMA | |
| RECCWG | Regional Emergency Communications Coordination Working Group | FEMA | |
| RECD | Rural Economic and Community Development | FEMA | |
| RECON | Reconnaissance | FEMA | |
| RECON | Reconsideration | FEMA | |
| RECP | Regional Emergency Communications Plan/Planner | FEMA | |
| RECS | Radiological Emergency Communications System | FEMA | CWMD | |
| REDAM | Radiological Emergency Dose Assessment Model | FEMA | |
| REDCAP | Readiness and Capability Exercise | FEMA | |
| REDI | Regional Emergency Disaster Inventory | FEMA | |
| REL | Recommended Exposure Limit | FEMA | |
| REM | Roentgen Equivalent Man/Mammal | FEMA | |
| REMS | Remote Environmental Monitoring System | FEMA | |
| REMT | Regional Emergency Management Team | FEMA | |
| RENC | Regional Emergency Notification Center | FEMA | |
| REO | Regional Environmental Officer | FEMA | |
| REOC | Regional Emergency Operations Center | FEMA | |
| REP | Radiological Emergency Preparedness | FEMA | |
| REP | Regional Evacuation Plan | FEMA | |
| REP | Regional Evacuation Point | FEMA | |
| REPLO | Regional Emergency Preparedness Liaison Officer | FEMA | |
| REPP | Radiological Emergency Preparedness Program | FEMA | |
| REPPM | Radiological Emergency Preparedness Program Manual | FEMA | |
| REPS | Remote EHU Property System | FEMA | |
| RER | Record of Environmental Review | FEMA | |
| RERO | Radiological Emergency Response Operations | FEMA | |
| RERP | Radiological Emergency Response Plan | FEMA | |
| RERT | Radiological Emergency Response Team | CWMD | |
| RESL | Resource Unit Leader | FEMA | |
| RESTAT | Resources Status | FEMA | |
| RET | Regional Emergency Transportation | FEMA | |
| RET | Retardant | FEMA | |
| RET | Retirement | FEMA | |
| RETCO | Regional Emergency Transportation Coordinator | FEMA | |
| RETOPS | Radiological Emergency Team Operations | FEMA | |
| RETREP | Regional Emergency Transportation Representative | FEMA | |
| REX | Readiness Exercise | FEMA | |
| RF | Radio Frequency | FEMA | |
| RFA | Request for Federal Assistance | FEMA | |
| RFC | request for change | MGMT | |
| RFC | River Forecast Center | FEMA | |
| RFD | Rescue Floatation Device | FEMA | |
| RFI | Radio Frequency Interference | FEMA | |
| RFI | Request for information | FEMA | |
| RFI | request for information [acquisition] | S&T | |
| RFID | Radio Frequency Identification | CBP | TSA | PLCY | PRIV | |
| RFO | Ready for Occupancy | FEMA | |
| RFO | Regional Field Office | FEMA | |
| RFP | Request for Proposal | FEMA | S&T | MGMT | OPA | |
| RFQ | Request for Quote | I&A | MGMT | |
| RFS | Request for Service | FEMA | |
| RFSI | Residential Fire Safety Institute (former OLS) | FEMA | |
| RG | Review Guide | FEMA | |
| RGN | Region | FEMA | |
| RHA | Reduced Hazard Ammunition | FLETC | |
| RHA | Regional Health Administrator | FEMA | |
| RHA | Rural Housing Agency | FEMA | |
| RHAVE | Risk Hazard and Value Evaluation Program | FEMA | |
| RHS | Rural Housing Service | FEMA | |
| RI | Registration Intake | FEMA | |
| RI | Remedial Investigation | FEMA | |
| RIA | Requiring Immediate Action | FEMA | |
| RIAT | Rapid Impact Assessment Team | FEMA | |
| RIC | Recovery Information Center | FEMA | |
| RICCS | Regional Incident Communication and Coordination System | FEMA | OPA | |
| RICO | Racketeer Influenced and Corrupt Organization | ICE | |
| RICT | Regional Incident Coordination Team | FEMA | |
| RIF | Reduction in Force | FEMA | |
| RIID | Radiation Isotope Identifier Device | CBP | |
| RIJAN | Regional Information Joint Awareness Network | CISA | CWMD | OPS | |
| RIO | Regional Investment Officer | FEMA | |
| RIP | Routing Information Protocol | FEMA | |
| RIS | Regulatory Issue Summary | FEMA | |
| RISC | Regional Interagency/Interoffice Steering Committee | FEMA | |
| RISS | Regional Information Sharing Systems Center | I&A | |
| RISS or RISSNET | Regional Information Sharing System | CISA | |
| RIT | Rapid Intervention Team (Fire/Rescue) | FEMA | |
| RITF | Rapid Intervention Task Force (Fire/Rescue) | FEMA | |
| RKB | Responder Knowledge Base | FEMA | |
| RL | Recording level | FEMA | |
| RL | Repetitive Loss | FEMA | |
| RLE | Run Length Encoding | FEMA | |
| RLP | Repetitive Loss Property | FEMA | |
| RLS | Registered Land Surveyor | FEMA | |
| RLTG | Repetitive Loss Target Group | FEMA | |
| RM | Radiological Monitor | FEMA | |
| RM | Records Management | FEMA | |
| RM | Resource Manager | FEMA | |
| RM | Risk Management | FEMA | |
| RMA | Risk Management Agency | FEMA | |
| RMA | Risk Management and Analysis, Office of (NPPD/RMA) | DHS | |
| RMAT | Risk Management Assessment Tool | TSA | CISA | |
| RMD | Risk Management Division | FEMA | |
| RMEC | Regional Military Emergency Coordinator | FEMA | |
| RMG | Resource Management Group | FEMA | |
| RMI | Republic of the Marshall Islands | FEMA | |
| RMM | River Mile Marker | FEMA | |
| RMNCS | Regional Manager National Communications System | FEMA | |
| RMRIWFCG | Rocky Mountain Regional Interagency Wildland Fire Communications Group | FEMA | |
| RMS | Root Mean Square | FEMA | |
| RMSE | Root Mean Square Error | FEMA | |
| RMSI | Regional Maritime Security Initiative | USCG | |
| RMT | Radiological Monitoring Team | FEMA | |
| RMTN | Regional Meteorological Telecommunications Network | FEMA | |
| RMTO | Resources Management Transformation Office | FEMA | |
| RN | Registered Nurse | FEMA | |
| RNA | Rapid Needs Assessment | FEMA | |
| RNAT | Rapid Needs Assessment Team | FEMA | |
| RNCSAA | Radiological & Nuclear Countermeasure System Architectures Analysis | S&T | |
| RNCTEC | Radiological/Nuclear Counter-measures Test & Evaluation Complex | CWMD | |
| RNMCB | Reserve Naval Mobile Construction Battalion | FEMA | |
| RO | Radiological Officer | FEMA | |
| RO | Read Only | FEMA | |
| RO | Receive-Only | FEMA | |
| RO | Regional Office | FEMA | |
| RO | Reports Officer | FEMA | |
| RO | Responsible Officer | FEMA | |
| ROB | Regional Office Building | FEMA | |
| ROBCAT | Rules of Behavior and Computer Awareness Training | FEMA | |
| ROC | Regional Operations Center (see RRCC) | FEMA | |
| ROD | record of decision [EPA] | DHS | |
| ROD | Record of Decision | FEMA | |
| ROE | Right-of Entry | FEMA | |
| ROE | Rules of Engagement | FEMA | |
| ROI | return on investment [risk] | PLCY | |
| ROI | Report of Investigation | ICE | CWMD | |
| ROM | rough order of magnitude | MGMT | |
| ROM | Read-Only Memory | FEMA | |
| RON | Remain Overnight | DHS | |
| ROR | Released on their Own Recognizance | FEMA | |
| RORO | Roll On/Roll-Off | FEMA | |
| RO-RO | roll-on, roll-off ship | PLCY | |
| ROS | Response Operating System | FEMA | |
| ROSS | Resource Ordering and Status System | FEMA | |
| ROST | Regional Office Support Team | FEMA | |
| ROST | Regional Operations Support Team | FEMA | |
| ROTHR | Relocatable Over the Horizon Radar | ICE | |
| ROWPU | Reverse Osmosis Water Purification Unit | FEMA | |
| RP | Real Property | FEMA | |
| RPA | Regional Planning Agent | FEMA | |
| RPA | Request for Public Assistance | FEMA | |
| RPA | Resources Planning Act | FEMA | |
| RPBP | Reduced Pressure Backflow Preventer | FEMA | |
| RPC | Regional Preparedness Committee | FEMA | |
| RPG | resource planning guidance | MGMT | |
| RPG | Response Planning Guide | FEMA | |
| RPH | Resource Priority Header | FEMA | |
| RPM | Radiation Portal Monitor | CBP | USCG | CWMD | |
| RPM | Remedial Project Manager | FEMA | |
| RPM | Revolutions per Minute | FEMA | |
| RPO | Regional Project Officer | FEMA | |
| RPOC | Regional Point of Contact | FEMA | |
| RPP | Radiological Pilot Project | FEMA | |
| RPPO | Radiological Pilot Program Office | CWMD | |
| RPS | Radiological Protection System | FEMA | |
| RPT | Radiation Protection Technician | FEMA | |
| RPT | Report | FEMA | |
| RPV | Remotely Piloted Vehicle | CBP | ICE | |
| RQ | Reportable Quantity | FEMA | |
| RR | Railroad | FEMA | |
| RR | Response & Recovery (also R&R) | FEMA | |
| RR | Rest and Relaxation | FEMA | |
| RR | Rural Route | FEMA | |
| RRAC | Regional Radiological Assistance Committee | FEMA | |
| RRB | Railroad Retirement Board | FEMA | |
| RRCC | Regional Response Coordination Center | FEMA | |
| RRF | Regional Response Force | FEMA | |
| RRIS | Rapid Response Information System | FEMA | |
| RRP | Regional Response Plan | FEMA | |
| RRR | Readiness, Response and Recovery | FEMA | |
| RRRV | Regional Rapid Response Vehicle | FEMA | |
| RRT | Radiological Response Team | FEMA | |
| RRT | Regional Response Team | FEMA | |
| RRWG | Reward and Recognition Working Group | FEMA | |
| RS | Regional Summary | FEMA | |
| RS | Relay System | FEMA | |
| RS | Remote Sensing | FEMA | |
| RS | Response Support | FEMA | |
| RSAT | Risk Self Assessment Tool (formerly VISAT) | CISA | |
| RSC | Remote Sensing Coordinator | FEMA | |
| RSD | Remote Sensing Data | FEMA | |
| RSI | Repetitive Stress Injury | FEMA | |
| RSL | Recommended Standard List | FEMA | |
| RSO | Radiation Safety Officer | FEMA | |
| RSOI | Reception, Staging, Onward movement, and Integration | FEMA | |
| RSP | Regular Services Program | FEMA | |
| RSP | Render Safe Procedures | FEMA | |
| RSPA | Research and Special Programs Administration | FEMA | |
| RSS | Really Simple Syndication | FEMA | |
| RSS | Remote Storage Site | FEMA | |
| RSSC | Remote Sensing Support Coordinator | FEMA | |
| RST | Reference Standard Time | FEMA | |
| RST | Regional Support Team | FEMA | |
| RST | Remote Sensing Team | FEMA | |
| RST | Render Safe Team | FEMA | |
| RSTA | Reconnaissance, Surveillance and Target Acquisitions | FEMA | |
| RSU | Response Support Unit | FEMA | |
| RSU | Reunification Services Unit | FEMA | |
| RSVP | Retired Senior Volunteer Program | FEMA | |
| RT | Registered Traveler | FEMA | |
| RT | Resource Tracker | FEMA | |
| RT | Resource Tracking | FEMA | |
| RTAP | Rapid Technology Application Program | S&T | |
| RTAP | Real-Time Analytical Platform | FEMA | |
| RTC | Road to Crisis | FEMA | |
| RTCC | Real Time Crime Center | I&A | |
| RTF | Responder/Response Task Force | FEMA | |
| RTF | Rich Text Format | FEMA | |
| RTF-E | Response Task Force - East | FEMA | |
| RTF-W | Response Task Force - West | FEMA | |
| RTI | Regional Technology Integration | USCG | MGMT | |
| RTK | Real Time Kinematic | FEMA | |
| RTM | Regional Training Manager | FEMA | |
| RTS | Regional Transit System | FEMA | |
| RTSWG | Regional Transit Security Working Group | FEMA | |
| RTT | Regional Transition Team | FEMA | |
| RUL | Resource Unit Leader | FEMA | |
| RUS | Rural Utilities Service | FEMA | |
| RVAC | Regional Visual Analytics Center | FEMA | |
| RVSS | Remote Video Surveillance Systems | FEMA | |
| RVT | Remote Video Terminal | FEMA | |
| RWA | Reimbursable Work Authorization | FEMA | |
| RWP | Regional Work Plan | FEMA | |
| RWS | Revised Work Schedule | FEMA | |
| RX | Prescribed (fire) | FEMA | |
| RX | Prescription (medical) | FEMA | |
| RX | Reactor | FEMA | |
| RXB1 | Prescribed Fire Burn Boss 1 | FEMA | |
| RXB2 | Prescribed Fire Burn Boss 2 | FEMA | |
| RXB3 | Prescribed Fire Burn Boss 3 | FEMA | |
| RXCM | Prescribed Fire Crew Member | FEMA | |
| RXI1 | Ignition Specialist Type 1 | FEMA | |
| RXI2 | Ignition Specialist Type 2 | FEMA | |
| RXM1 | Prescribed Fire Manager Type 1 | FEMA | |
| RXM2 | Prescribed Fire Manager Type 2 | FEMA | |
| RXPL | Prescribed Fire Planner | FEMA | |
| S number | Supply number | FEMA | |
| S&E | Salaries and Expenses | FEMA | |
| S&L | Savings and Loan | FEMA | |
| S&L | State and Local | FEMA | |
| S&T | Science and Technology [Directorate] | DHS | |
| S-60 | DOT Office of Intelligence Security | DHS | |
| SA | Salvation Army | FEMA | |
| SA | State agency | FEMA | |
| SA | Support Agency | FEMA | |
| SA | Special Agent | DHS | |
| SAA | State Administrative Agency | FEMA | |
| SAAM | Special Airlift Assignment Mission | FEMA | |
| SAAR | Secretary's After Action Report | FEMA | |
| SAAT | Standardized Awareness Authorized Trainer | FEMA | |
| SABA | Supplied Air Breathing Apparatus | FEMA | |
| SABT | Special Agent Bomb Technician | DHS | |
| SAC | Special Agent in Charge | FEMA | ICE | |
| SAC | Special Agency in Charge | FEMA | |
| SACS | Secure Access Control System | FEMA | |
| SAD | Southern Area District | FEMA | |
| SAE | Site Area Emergency | FEMA | |
| SAE | Stafford Act Employee (also DAE) | FEMA | |
| SAFE | Screening Applied Fairly and Equitably [to truckers] | TSA | |
| SAFE | Secure All-around Flotation Equipped | USCG | |
| SAFE | Security and Accountability for Every Port | USCG | |
| SAFE | Secure Against Fires and Embers | FEMA | |
| SAFE TEA | Safe, Accountable, Flexible, Efficient Transportation Equity Act | TSA | USCG | |
| SAFECOM | Safe Community | S&T | |
| SAFECOM | Safety Communique | FEMA | |
| SAFER | Staffing for Adequate Fire and Emergency Response | FEMA | |
| SAFETY ACT | Support Anti-terrorism by Fostering Effective Technologies Act (2002) | S&T | |
| SAFTI | Secure and Facilitated International Travel Initiative | CBP | TSA | |
| SAG | Senior Advisory Group | FEMA | |
| SAIC | Special Agent in Charge | USSS | |
| SAIC | Science Applications International Corporation | FEMA | MGMT | OPA | |
| SAIL | Secure Automobile Inspection Lanes | TSA | |
| SAL | Salvation Army | FEMA | |
| SALEMDUG | State and Local Emergency Managers Data Users Group | FEMA | |
| SAM | Surface to Air Missile | TSA | |
| SAM | Surface to Air Missile (affiliated with TSA) | FEMA | |
| SAME | Specific Area Message Encoding | FEMA | |
| SAMHSA | Substance Abuse and Mental Health Services Administration | FEMA | |
| SAML | Security Assertion Markup Language | FEMA | |
| SAMP | Special Area Management Plan | FEMA | |
| SAN | Storage Area Network | FEMA | |
| SANS | SysAdmin, Audit, Network, Security (SANS Institute) | FEMA | |
| SANS | Ship Arrival Notification System | USCG | I&A | |
| SAO | Senior Accountable Official [Directive System] | DHS | |
| SAO | Senior Agency Official[Classified Information] | MGMT | |
| SAO | Security Advisory Opinions | CBP | USCIS | |
| SAO | State Approving Officer | FEMA | |
| SAO | State Approving Official (affiliated with FEMA) | FEMA | |
| SAP | Special Access Program | FEMA | |
| SAP | State Action Plan | FEMA | |
| SAP | State Administrative Plan | FEMA | |
| SAR | suspicious activity reporting | I&A | MGMT | |
| SAR | Safety Analysis Report | FEMA | |
| SAR | Search and Rescue | FEMA | |
| SAR | Sector Annual Reports | FEMA | |
| SAR | Special Access Required | FEMA | |
| SAR | Synthetic Aperture Radar | FEMA | |
| SAR | Suspicious Activity Report | ICE | I&A | |
| SARA | Superfund Amendments and Reauthorization Act | FEMA | |
| SARDA | State Airborne Reconnaissance for Damage Assessment | FEMA | |
| SAREX | Search and Rescue Exercise | FEMA | USCG | |
| SARS | Severe Acute Respiratory Syndrome | USCIS | |
| SARS | Security Activities Reporting System | MGMT | |
| SARSAT | Search and Rescue Satellite-Aided Tracking | FEMA | |
| SART | State Animal Response Team | FEMA | |
| SAS | Scientific Analysis Section | FEMA | |
| SAS | Secondary Antenna System | FEMA | |
| SASS | Student Administration and Scheduling System | FEMA | |
| SAST | Scientific Assessment and Strategy Team | FEMA | |
| SAT | Satellite | FEMA | |
| SAT | Search Augmentation Team | FEMA | |
| SAT | Simplified Acquisition Threshold | FEMA | |
| SATCOM | Satellite Communications | FEMA | |
| SATERN | Salvation Army Team Emergency Radio Network | FEMA | |
| SATO | Scheduled Airline Ticket Office | FEMA | |
| SAV | Site Assistance Visit | FEMA | CISA | |
| SAV | Staff Assistance Visit | FEMA | |
| SAVE | Systematic Alien Verification Entitlements | USCIS | |
| SAVER | Systems Assessment and Validation for Emergency Responders | FEMA | |
| SAVER | Systems Assessments Validation and Equipment Response | FEMA | |
| SAVI | Suspect and Violator Indices | CBP | ICE | USCIS | I&A | |
| SBA | Shared Border Accord | CBP | USCG | |
| SBA | Small Business Administration | DHS | |
| SBACC | Shared Border Accord Coordination Committee | FEMA | |
| SBC | Southern Baptist Convention | FEMA | |
| SBCCI | Southern Building Code Congress International | FEMA | |
| SBCCOM | Soldier and Biological Chemical Command (United States Army) | FEMA | |
| SBD | Smart Border Declaration | CBP | |
| SBD | Strategic Policy and Budget Division (S&T/SBD) | DHS | |
| SBDC | Small Business Development Center | FEMA | |
| SBI | Secure Border Initiative | CBP | |
| SBI | Special Background Investigation | FEMA | |
| SBINET | Secure Border Initiative Network | CBP | |
| SBIR | Small Business Innovation Research | S&T | |
| SBL | Straight Bill of Lading (also SBOL) | FEMA | |
| SBOL | Straight Bill of Lading | FEMA | |
| S-BOSS | Scenario-Based Orientation for Senior Staff | FEMA | |
| SBU | Sensitive But Unclassified | DHS | |
| SC | Section Chief | FEMA | |
| SC | Study Contractor | FEMA | |
| SCADA | Supervisory Control and Data Acquisition System | S&T | I&A | |
| SCAT | Security Control of Air Traffic | FEMA | |
| SCAT | Space Coast Area Transit (Florida) | FEMA | |
| SCATANA | Security Control of Air Traffic and Air Navigation Aids | FEMA | |
| SCBA | services and components based architecture | MGMT | |
| SCBA | Self-Contained Breathing Apparatus | FEMA | |
| SCC | Sector Command Center | PLCY | |
| SCC | Sector Coordinating Council | FEMA | |
| SCC | Secretary's Command Center | DHS | |
| SCC-J | Sector Command Center - Joint | PLCY | |
| SCD | Service Computation Date | FEMA | |
| SCEC | Southern California Earthquake Center | FEMA | |
| SCEPC | Senior Civil Emergency Planning Committee | FEMA | |
| SCG | Security Classification Guide | FEMA | |
| SCI | Sensitive Compartmented Information | DHS | |
| SCIC | Software Control Integration Center | FEMA | |
| SCIF | Sensitive Compartmented Information Facility | FEMA | USSS | I&A | |
| SCION | Sensitive Compartmented Information Operational Network | I&A | |
| SCIP | Statewide Communications Interoperability Plan/Planning | FEMA | |
| SCM | Survivable Crisis Management | FEMA | |
| SCO | Screening Coordination Office (PLCY/SCO) | DHS | |
| SCO | State Coordinating Officer | FEMA | |
| SCOTUS | Supreme Court of the United States | FEMA | |
| SCP | Security Control Point | TSA | |
| SCR | Software (or System) Change Request | FEMA | |
| SCRAG | Senior Civilian Representative of the Attorney General | FEMA | |
| SCRR | Special Conversion Recommendation Report | FEMA | |
| SCS | Soil and Conservation Service | FEMA | |
| SCSEP | Senior Citizen Service Employment Program | FEMA | |
| SCSN | Southern California Seismic Network | FEMA | |
| SCUB | Scuba Diver | FEMA | |
| SD | Static Data | FEMA | |
| SD | Security Directive | DHS | |
| SD&D | System Development and Demonstration | FEMA | |
| SDA | Seventh Day Adventist | FEMA | |
| SDD | Software Development Division | FEMA | |
| SDF | Special Direct Facility | FEMA | |
| SDK | Software Development Kit | FEMA | |
| SDLO | Senior Disaster Logistics Officer | FEMA | |
| SDLO | Senior Disaster Logistics Official | FEMA | |
| SDM | Scenario Development Message | FEMA | |
| SDO | Staff Duty Officer | FEMA | |
| SDO | Standards Development Organization | FEMA | |
| SDP | Secretarial Development Program | FEMA | |
| SDP | Service Delivery Point | FEMA | |
| SDSFIE | Spatial Data Standard for Facilities, Infrastructure, and Environment | FEMA | |
| SDTS | Spatial Data Transfer Standard | FEMA | |
| SDTS | Spatial Data Transfer System | FEMA | |
| SDUSM | Special Deputy United States Marshall | FEMA | |
| SDVOSB | Service Disabled Veteran Owned Small Business | FEMA | |
| SDWIS | Safe Drinking Water Information System | FEMA | |
| SE | systems engineering | S&T | |
| SEAR | special event assessment rating | I&A | |
| SEAR | Special Events Assessment Rating | CISA | OPS | |
| SEAT | Single Engine Air Tankers | FEMA | |
| SEB | Staphylococcus Enterotoxin type B | FEMA | |
| SEC | Secretary, Office of the | DHS | |
| SEC | Securities and Exchange Commission | DHS | |
| SEC1 | Security Specialist Level 1 | FEMA | |
| SEC2 | Security Specialist Level 2 | FEMA | |
| SECARMY | Secretary of the Army | FEMA | |
| SECC | State Emergency Coordination Center | FEMA | |
| SECDEF | Secretary, Department of Defense | FEMA | |
| SECDHS | Secretary, Department of Homeland Security | FEMA | |
| SECG | Security Guard (not LE) | FEMA | |
| SECHHS | Secretary, Department of Health and Human Services | FEMA | |
| SECLAN | Secure Local Area Network | FEMA | |
| SECM | Security Manager | FEMA | |
| SECURE | Strategic Communications Resources Effort | DHS | |
| SED | Shippers Export Declaration | CBP | |
| SED | Systems Engineering and Development | FEMA | |
| SEI | Software Engineering Institute | FEMA | |
| SEL | Standardized Equipment List | FEMA | |
| SELC | systems engineering life cycle | I&A | |
| SELS | Severe Local Storms | FEMA | |
| SEM | Seattle Emergency Management | FEMA | |
| SEMA | State Emergency Management Agency | FEMA | CISA | |
| SEMO | State Emergency Management Office | FEMA | CISA | |
| SEMS | Standardized Emergency Management System | FEMA | |
| SENTINEL | Securing the Nation through Infrastructure Enhancements Locally | CISA | |
| SENTRI | Secure Electronic Network for Travelers Rapid Inspection | CBP | PLCY | PRIV | |
| SEO | Senior Energy Official | FEMA | |
| SEOC | State Emergency Operations Center | FEMA | CISA | |
| SEP | State Emergency Plan | FEMA | |
| SEPLO | State Emergency Preparedness Liaison Officer | FEMA | |
| SERC | State Emergency Response Commission | FEMA | |
| SERF | Standard Exercise Report Form/Format | FEMA | |
| SERFC | (NWS) Southeast River Forecast Center | FEMA | |
| SERL | Special Events Readiness Level (see below) | FEMA | |
| SERL I | Unique event requiring full support of United States Government | FEMA | |
| SERL II | Primary event requiring local resource augmentation and limited predeployment of United States Government assets | FEMA | |
| SERL III | Secondary event requiring limited local resource augmentation and limited predeployment of United States Government assets | FEMA | |
| SERL IV | Minor event generally requiring no United States Government asset support | FEMA | |
| SERRI | Southeast Region Research Initiative | S&T | |
| SERT | Secretary's Emergency Response Team (DHHS) | FEMA | |
| SERT | State Emergency Response Team | FEMA | CISA | |
| SES | Senior Executive Service | MGMT | |
| SES | senior executive service position | MGMT | |
| SES CDP | Senior Executive Service Candidate Development Program (DHS) | FEMA | |
| SET | Source Evaluation Team | TSA | |
| SETCP | Southeast Transportation Corridor Pilot | CWMD | |
| SEUS | Snow Estimation and Updating System | FEMA | |
| SEVIS | Student and Exchange Visitor Information System | ICE | I&A | PLCY | PRIV | |
| SEVP | Student and Exchange Visitor Program | ICE | |
| SEWG | Special Events Operating Group | OPS | |
| SF | Security Forces | FEMA | |
| SF | Special Facility | FEMA | |
| SF | Special Forces | FEMA | |
| SF | Standard Form | FEMA | |
| SF6 | sulfur hexafluoride | DHS | |
| SFAR | Special Federal Aviation Regulation | FEMA | |
| SFDRA | Senior Foreign Disclosure and Release Authority | I&A | |
| SFHA | Special Flood Hazard Area | FEMA | |
| SFI | Secure Freight Initiative | CBP | |
| SFIP | Standard Flood Insurance Policy | FEMA | |
| SFLEO | Senior Federal Law Enforcement Officer | FEMA | |
| SFLEO | Senior Federal Law Enforcement Official | FEMA | |
| SFO | Senior Financial Officer | MGMT | |
| SFO | Senior Federal Official | FEMA | |
| SFO | Senior FEMA Official | FEMA | |
| SFO | State Field Office | FEMA | |
| SFO | State Field Officer | FEMA | |
| SFP | Supplementary Feeding Program | FEMA | |
| SFPE | Society of Fire Protection Engineers | FEMA | |
| SFSO | Senior Financial Services Officer | FEMA | |
| SG | Surgeon General | FEMA | |
| SGE | Special Government Employee | FEMA | |
| SGML | Standard Generalized Markup Language | FEMA | |
| SGT | Senior Guidance Group | OPS | |
| SGTP | Society of Government Travel Professionals | PLCY | |
| SGTR | Steam Generator Tube Rupture | FEMA | |
| SGTS | Standard Gas Treatment System | FEMA | |
| SHA | Secure Hash Algorithm | FEMA | |
| SHARE | Safety, Health, and Return-to-Employment | FEMA | |
| SHARES | SHAred RESources | FEMA | |
| SHCP | Strategic Human Capital Plan | FEMA | |
| SHEMS | safety, health, environmental management system | S&T | |
| SHIELD | Strategic Hazard Identification Evaluation for Leadership Decisions | CISA | |
| SHIRA | Strategic Homeland Infrastructure Risk Assessment | CISA | |
| SHMO | State Hazard Mitigation Officer | FEMA | |
| SHMP | State Hazard Mitigation Program | FEMA | |
| SHO | Safety and Health Official | FEMA | |
| SHO | State Health Officer | FEMA | |
| SHPO | State Historic Preservation Office | FEMA | |
| SHSAS | State Homeland Security Assessment and Strategy | FEMA | |
| SHSEEP | State Homeland Security Exercise and Evaluation Program | FEMA | |
| SHSGP | State Homeland Security Grant Program | FEMA | |
| SHSI | Sensitive Homeland Security Information | OPS | |
| SHSP | State Homeland Security Program | FEMA | |
| SHSS | State Homeland Security Strategy | FEMA | |
| SIA | Special Interest Alien | FEMA | |
| SIAM | Structure Ignition Assessment Model | FEMA | |
| SICCL | State Incident Communications Conference Line | FEMA | |
| SICG | Senior Interagency Coordination Group | FEMA | |
| SID | Station Identifier | FEMA | |
| SID | System Identifier | FEMA | |
| SIDA | Security Identification Display Area | TSA | PLCY | PRIV | |
| SIEC | State Interoperability Executive Committee | FEMA | |
| SIED | Special Improvised Explosive Device | FEMA | |
| SIES | Strategic Industries and Economic Security, Office of | FEMA | |
| SIF | Standard Interchange Format | FEMA | |
| SIGINT | Signals Intelligence | OPS | PLCY | PRIV | |
| SIGMET | Significant Meteorological Information | FEMA | |
| SII | Security/Suitability Investigations Index | I&A | |
| SIIA | Software and Information Industry Association | PLCY | PRIV | |
| SIM | subscriber identity module | MGMT | |
| SIMBAD | Sensor Integration and Modeling for Biological Agent Detection | FEMA | |
| SIMCELL | Simulation Cell | FEMA | |
| SIMCEN | (National Exercise) Simulation Center | FEMA | |
| SIN | standing information need | I&A | |
| SIO | Senior Infrastructure Officer | MGMT | |
| SIOC | Strategic Information and Operations Center | I&A | |
| SIOC | Strategic Intelligence and Operations Center | FEMA | |
| SIOP | Single Integrated Operational Plan | FEMA | |
| SIP | state implementation plans | DHS | |
| SIP | Session-Initiation Protocol (NGN) | FEMA | |
| SIP | Shelter-In-Place | FEMA | |
| SIP | Streamlined Inspection Program | FEMA | |
| SIPRNet | Secure Internet Protocol Router Network | I&A | |
| SIPRNET | Secret Internet Protocol Router Network | I&A | MGMT | PLCY | |
| SIRIXS | Secure Infrastructure for Rapid Information Exchange Solution | FEMA | |
| SIT | Situation Reporting System | FEMA | |
| SIT REPORT | Interagency Management Situation Report (summary of nationwide fire statistics) | FEMA | |
| SITL | Situation Unit Leader | FEMA | |
| SITMAN | Situation Manual | FEMA | |
| SITO | Senior Insider Threat Official | I&A | |
| SITREP | Situation Report | FEMA | |
| SITROOM | Situation Room | FEMA | |
| SITSTAT | Situation Status | FEMA | |
| SL | senior level position | MGMT | |
| SL | Senior-Level | FEMA | |
| SL&T | State, local, and Tribal (NRF, ESF 13 Annex) | FEMA | |
| SLA | Service Level Agreement | FEMA | |
| SLA | State and Local Assistance | FEMA | |
| SLAR | Side-Looking Airborne Radar | FEMA | |
| SLBM | Submarine-Launched Ballistic Missile | FEMA | |
| SLC | Salt Lake City | FEMA | |
| SLC | Subscriber Line Carrier | FEMA | |
| SLE | State and Local Exercise | FEMA | |
| Sleeping Dragon | Term used to identify a barrier of protesters who have linked themselves to one another | FEMA | |
| SLEP | State and Local Exercise Program | FEMA | |
| SLFC | State and Local Fusion Center | I&A | |
| SLG | Senior Leadership Group | OPS | |
| SLG | State and Local Guide | FEMA | |
| SLGCP (see SLGC) | State and Local Government Coordination & Preparedness (now NPPD/IGP) | CISA | |
| SLLE | State and Local Law Enforcement, Office for (PLCY/SLLE) | DHS | |
| SLM | Sound Level Meter | FEMA | |
| SLO | State Liaison Officer | FEMA | |
| SLOSH | Sea, Lake and Overland Surges from Hurricanes | FEMA | |
| SLP | State & Local Program | FEMA | |
| SLPA | Sea Level Pressure Anomaly | FEMA | |
| SLPS | State & Local Programs & Support Directorate | FEMA | |
| SLRFC | State, Local and Regional Fusion Center | FEMA | |
| SLSAC | State and Local Officials Senior Advisory Committee | CISA | PLCY | |
| SLUDGEM | Salivation, Lacrimation, Urination, Defecation, Gastric Distress, Emesis and Miosis | FEMA | |
| SM | Shelter Management | FEMA | |
| SM | Student Manual | FEMA | |
| SMAC | State Mapping Advisory Committee | FEMA | |
| SMB | Secretary's Morning Brief | FEMA | |
| SMC | Specialty/Specialized Management Center | FEMA | |
| SMCC | System Management Control Center | FEMA | |
| SME | Subject Matter Expert | DHS | |
| SME PED | Secure Mobile Environment Portable Electronic Device | FEMA | |
| SMG | Specialty Management Group | FEMA | |
| SMHA | State Mental Health Agency | FEMA | |
| SMI | Safety Management Institute | FEMA | |
| SMI | Smithsonian Institute | FEMA | |
| S-MIME | Secure MIME | FEMA | |
| SMMA | Standard Mitigation Measures Agreement | FEMA | |
| SMO | See OCSO | DHS | |
| SMP | State Mitigation Plan | FEMA | |
| SMS | Short Message Service | FEMA | |
| SMS | Software Management System | FEMA | |
| SMSA | Standard Metropolitan Statistical Area | FEMA | |
| SMSD | State-Managed Small Disaster | FEMA | |
| SMTP | Simple Mail Transfer Protocol | FEMA | |
| SMU | Special Mission Unit | FEMA | |
| SMU | Special Mission Unit (affiliated with FEMA) | FEMA | |
| SMURC | Satellite Mobile US&R Resupply Cache | FEMA | |
| SN | Serial Number | FEMA | |
| SNA | Survivable Network Analysis | FEMA | |
| SNJTK | Special Needs Jurisdiction Tool Kit | FEMA | CISA | |
| SNL | Sandia National Laboratory | S&T | |
| SNM | Specific Nuclear Material | CWMD | |
| SNMP | Simple Network Management Protocol | FEMA | |
| SNOMED | Systematized Nomenclature of Medicine | FEMA | |
| SNPRM | Supplemental Notice of Proposed Rulemaking [see also ANPRM and NPRM] | OGC | |
| SNS | Strategic National Stockpile and National Disaster Medical System | FEMA | CISA | OGC | CWMD | |
| SNSEE | School for National Security Executive Education (NDU) | FEMA | |
| SNWDI | Critical Nuclear Weapon Design Information | FEMA | |
| SO | Safety Officer | FEMA | |
| SO | Sheriff’s Office | FEMA | |
| SOA | Service Oriented Architecture | FEMA | |
| SOAP | Simple Object Access Protocol | FEMA | |
| SOB | Souls On Board | FEMA | |
| SOC | Security Operations Center | FEMA | |
| SOC | State Operations Center | FEMA | |
| SOC | Statement of Concern | FEMA | |
| SOCA | Seed Key-ONLY COMSEC Account | FEMA | |
| SOCMA | Synthetic Organic Chemical Manufacturers Association | CISA | |
| SOE | Senior Officials Exercise | FEMA | |
| SOE | Summary of Expenses | FEMA | |
| SOF | Special Operations Forces | FEMA | |
| SOF1 | Safety Officer Type 1 | FEMA | |
| SOF2 | Safety Officer Type 2 | FEMA | |
| SOFA | Status of Forces Agreement | FEMA | |
| SOFR | Safety Officer, Line | FEMA | |
| SOG | Seat of Government | FEMA | |
| SOG | Standard Operating Guideline | FEMA | |
| SOI | Southern Oscillation Index | FEMA | |
| SOIC | Senior Official of the Intelligence Community | FEMA | |
| SOLAS | Safety of Life at Sea | CBP | USCG | |
| SOLGEN | Solicitor General | FEMA | |
| SOLIC | Special Operations-Low Intensity Conflict | FEMA | |
| SOLRAD | Solar Radiation | FEMA | |
| SOMA | Summary of Map Actions | FEMA | |
| SON | Statement of Need | FEMA | |
| SONAR | Sound Navigation and Ranging | USCG | |
| SONET | Synchronous Optical Network | FEMA | |
| SONS | Spill of National Significance | FEMA | USCG | |
| SOO | Statement of Objective | DHS | |
| SOP | Safe Operating Procedure | FEMA | |
| SOP | Standard Operating Procedure | DHS | |
| SOPEP | Shipboard Oil Pollution Emergency Plan | FEMA | |
| SOR | Statement of Requirements | S&T | |
| SORDS | Stand-off Radiation Detection System | CWMD | |
| SORN | System of Record Notice | I&A | OGC | PLCY | PRIV | |
| SOS | system of systems | MGMT | |
| SOS | Status of Studies | FEMA | |
| SOSC | State On-Scene Coordinator | FEMA | |
| SOUTHCOM | Southern Command | TSA | |
| SOW | Statement of Work | DHS | |
| SP | Single Pedestal | FEMA | |
| SPAWAR | Space and Naval Warfare Systems Center | CISA | I&A | |
| SPC | Storm Prediction Center | FEMA | |
| SPCA | Society for the Prevention of Cruelty to Animals | FEMA | |
| SPD | Special Programs Division (S&T/SPD) | DHS | |
| SPE | Senior Procurement Executive | MGMT | |
| SPE | Skill Performance Evaluation | FEMA | |
| SPE | Strategic Planning and Evaluation | FEMA | |
| SPEGL | Short-term Public Emergency Guidance Level | FEMA | |
| SPEN | State Police Emergency Network | FEMA | |
| SPG | Senior Policy Group | FEMA | |
| SPG | Strategic Planning Guide | FEMA | |
| SPII | Sensitive Personally Identifiable Information | FEMA | |
| SPIRIT | Security, Planning, and Integrated Resources for Information Technology | PLCY | |
| SPL | Single Pedestal Left | FEMA | |
| SPLASH | Special Program to List the Amplitude of Surge from Hurricanes | FEMA | |
| SPM | System Programming and Maintenance | FEMA | |
| SPOC | Single Point of Contact | FEMA | |
| SPOC | Staffing Point of Contact | FEMA | |
| SPOD | Seaport of Debarkation | FEMA | |
| SPOE | Seaport of Embarkation | FEMA | |
| SPOT | Screening of Passengers by Observation Techniques | TSA | |
| SPOT | Satellite Positioning and Tracking | FEMA | |
| SPOT | Systeme Probatoire d’Observation de la Terre (French satellite system) | FEMA | |
| SPOTREPS | Spot Reports | OPS | |
| SPP | Security and Prosperity Partnership | TSA | PLCY | |
| SPP | Screening Partnership Program | TSA | |
| SPP | Secure Passage Program | TSA | |
| SPR | Single Pedestal Right | FEMA | |
| SPR | Special Problem Report | FEMA | |
| SPR | State Preparedness Report | FEMA | |
| SPR | Strategic Petroleum Reserve | FEMA | |
| SPRB | Senior Performance Review Board | FEMA | |
| SPRL | Southeast Poultry Research Laboratory | CWMD | |
| SPSCIF | Semi-Permanent Sensitive Compartmented Information Facility | FEMA | |
| SPUL | Supply Unit Leader | FEMA | |
| SQL | Structured Query Language | FEMA | |
| SRA | Safe Refuge Area | FEMA | |
| SRA | Society for Risk Analysis | FEMA | |
| SRC | Source | FEMA | |
| SRD | Self-Reading Dosimeter | FEMA | |
| SRF | Service Response Force | FEMA | |
| SRFC | Service Response Force Commander | FEMA | |
| SRFX | Service Response Force Exercise | FEMA | |
| SRM | service component reference model | MGMT | |
| SRM | Service Reference Model | FEMA | |
| SRSC | Strategic Review Steering Committee | FEMA | |
| SRT | Search Rescue Team | FEMA | |
| SRV | Safety Relief Value | FEMA | |
| SRWG | Site Remediation Working Group | FEMA | |
| SSA | Self Storage Association | PLCY | |
| SSA | Sector-Specific Agency | FEMA | |
| SSA | Senior State Advisor | FEMA | |
| SSA | Social Security Administration | DHS | |
| SSA | Survivable Systems Analysis | FEMA | |
| SSAA | System Security Authorization Agreement | FEMA | |
| SSAN | Social Security Account Number | FEMA | |
| SSAS | Strategic Sourcing and Acquisition Systems | MGMT | |
| SSB | Single Side Band | FEMA | |
| SSBI | Single-Scope Background Investigation | FEMA | |
| SSC | Scientific Support Coordinator | FEMA | |
| SSC | Senior Site Controller | FEMA | |
| SSC | Strategic Storage Center | FEMA | |
| SSCJ | San Diego Sector Command Center Joint | USCG | |
| SSD | Systems Support Division | FEMA | |
| SSE | Safe Shutdown Earthquake | FEMA | |
| SSFSD | Secret Service Forensic Sciences Division | USSS | |
| SSG | Strategic Sourcing Group | FEMA | |
| SSHS | Saffir-Simpson Hurricane Scale | FEMA | |
| SSI | Supplemental Security Income | FEMA | |
| SSL | Secure Socket Layer | FEMA | |
| SSN | Social Security Number | FEMA | |
| SSO | Special Security Officer | FEMA | |
| SSP | Sector Specific Plan | FEMA | CISA | |
| SSP | Species Survival Plan | FEMA | |
| SSR | Special Security Representative | MGMT | |
| SSR | Special Security Representative (MD 11039) | FEMA | |
| SSS | Selective Service System | DHS | |
| SSS | Small Structure Survey | FEMA | |
| SS-SATCOM | Slow Speed Satellite Communicator | FEMA | |
| SSSE | State Support Service Element | FEMA | |
| SST | Safe Secure Transport | FEMA | |
| SST | Sea-Surface Temperature | FEMA | |
| SST | Shelter Survey Technician | FEMA | |
| SST | Super-Sonic Transport | FEMA | |
| ST | scientific or professional position | MGMT | |
| ST ISAC | Surface Transportation Information Sharing and Analysis Center | FEMA | |
| STA | Special Temporary Authority | FEMA | |
| STAC | Science and Technology Advisory Committee | S&T | |
| STAM | Staging Area Manager | FEMA | |
| STAR | Strategic Threat and Action Report | CISA | |
| STAR | Science to Achieve Results | FEMA | |
| STAR | Studies, Training, Analysis and Research | FEMA | |
| STAR | Science-based Threat Analysis and Response Program | S&T | I&A | |
| STARC | State Area Command | FEMA | |
| STARS | Standard Terminal Automation Replacement System | FEMA | |
| START | Scientific and Technical Advisory and Response Team | S&T | |
| START | Security Through Advanced Research & Technology | S&T | |
| START | Scientific and Technical Analysis and Response Team | FEMA | |
| START | Superfund Technical Assessment and Response Team | FEMA | |
| STARTEAM | Specialized Target Area Registration Team | FEMA | |
| STARTEX | Start of Exercise | FEMA | |
| STATEX | Statutory Exclusion | FEMA | |
| STATREP | Status Report | FEMA | |
| STB | Surface Transportation Board | FEMA | |
| STC | Satellite Teleregistration Center | FEMA | |
| STC | Secure the Cities | CWMD | |
| STC | State Coordinator | FEMA | |
| STCC | Standard Transportation Commodity Code | FEMA | |
| STCR | Strike Team Leader Crew | FEMA | |
| STCW | Standards of Training, Certification and Watchkeeping [for Seafarers] | USCG | |
| STDO | Security Technology Deployment Office | FEMA | |
| ST-DOSE | Source Term to Dose | FEMA | |
| STDZ | Strike Team Leader Dozer | FEMA | |
| STE | Secure Telephone Equipment | DHS | |
| STEL | Short-Term Exposure Limit | FEMA | |
| STEM | Science, Technology, Engineering and Mathematics | S&T | |
| STEN | Strike Team Leader Engine | FEMA | |
| STEP | State Tribal Education Program | FEMA | |
| STEP | Security Training Exercise Program | TSA | USCG | |
| STL | Strike team leader | FEMA | |
| STLM | Strike Team Leader Military | FEMA | |
| STO | Special Technical Operations | FEMA | |
| STOC | Sniper Tactical Operations Center | FEMA | |
| STOLS | System to Locate Survivors | FEMA | |
| STOP | Strategy for Targeting Organized Piracy | CBP | |
| STP | Standard Temperature and Pressure | FEMA | |
| STPS | Structural Protection Specialist | FEMA | |
| STQ | Screening Threshold Quantities | CISA | |
| STR | Suspicious Transaction Report | FLETC | |
| STRATCOM | Strategic Command | FEMA | |
| STSC | Student and Schools System | CBP | TSA | USCG | USCIS | |
| STU | Secure Telephone Unit | DHS | |
| STUDS | Small Tactical Ubiquitous Detection Sensors | FEMA | |
| STU-III | Secure Telephone Unit – Third Generation | FEMA | |
| STU-IV | Secure Telephone Unit – Fourth Generation | FEMA | |
| SUA | Special Use Airspace | FEMA | |
| SUA | Specified Unlawful Activities | FEMA | |
| SUBD | Support Branch Director | FEMA | |
| SUI | Sensitive Unclassified Information | FEMA | |
| SUL | Situation Unit Leader | FEMA | |
| SUM | Software User’s Manual | FEMA | |
| SUMA | Supply Management | FEMA | |
| SUPREPS | Supplemental Reports Created by OIC | FEMA | |
| SUPSALV | Supervisor of Salvage | FEMA | |
| SUV | Sport Utility Vehicle | FEMA | |
| SVBD | Service Branch Director | FEMA | |
| SVBIED | suicide vehicle-borne improvised explosive device | S&T | |
| svc | service | FEMA | |
| SVC | Switched Virtual Circuits | FEMA | |
| SVIS | Secure Video System | FEMA | |
| SVOS | Secure Voice System | FEMA | |
| SVSS | Small Vessel Security Strategy | USCG | |
| SVTC | Secure Video Teleconference | DHS | |
| SVTS | Secured Video Teleconferencing System | DHS | |
| SW | Software | FEMA | |
| SW | Soil and Water | FEMA | |
| SWAT | Special Weapons and Tactics | FEMA | |
| SWC | Severe Weather Center | FEMA | |
| SWEL | Stillwater Flood Elevation | FEMA | |
| SWFL | Stillwater Flood Level | FEMA | |
| SWG | Scenario Working Group | FEMA | |
| SWG | Security Working Group | FEMA | |
| SWGDE | Scientific Working Group on Digital Evidence | USSS | |
| SWGFACT | Scientific Working Group for Forensic Analysis of Chemical Terrorism/Threats | FEMA | |
| SWIS | Satellite Weather Information System | FEMA | |
| SWO | Senior Watch Officer | FEMA | S&T | OPS | |
| SWP | State Warning Point | FEMA | |
| SWP | State Weekends Program | FEMA | |
| SWS | Severe Weather Statement | FEMA | |
| SWSA | Semantic Web Services Architecture | FEMA | |
| T&A | Time and Attendance | FEMA | |
| T&C | Time and Cost | FEMA | |
| T&E | Test and Evaluation | FEMA | |
| T&E | Threatened and Endangered | FEMA | |
| T&EPW | Training and Exercise Planning Workshop | FEMA | |
| T2 | Top Officials Exercise/TOPOFF 2 | FEMA | |
| TA | Table of Allowances | FEMA | |
| TA | Technical Assistance | FEMA | |
| TA | Time and Attendance | FEMA | |
| TA | Travel Authorization | FEMA | |
| TAC | Technical Advisory Committee | FEMA | |
| TAC | Technical Assistance Contractor | FEMA | |
| TACACS | Terminal Access Controller Access Control System | FEMA | |
| TACC | Training Academy Charter Committee | FEMA | |
| TAC-DESK | Tactical Desk | FEMA | |
| TACEX | Tactical Exercise | FEMA | |
| TACLET | Tactical Law Enforcement Team | USCG | |
| TACON | Tactical Control | FEMA | |
| TAC-SMC | Tactical Specialized Management Center | FEMA | |
| TAD | Technical Assistance Division | FEMA | |
| TADS | Threat Assessment Database System | FEMA | |
| TADS | Training Aids for Dam Safety | FEMA | |
| TAES | Tactical Aero-medical Evacuation System | FEMA | |
| TAFA | Terrorism and Foreign Assassination | USSS | |
| TAFIM | Technical Architecture Framework for Information Management | FEMA | |
| TAFS | Treasury appropriation fund symbol | MGMT | |
| TAFS | Treasury appropriation fund symbol [financial] | MGMT | |
| TAFT | Test, Analyze, Fix and Test | FEMA | |
| TAG | Technology & Architecture Group | FEMA | |
| TAG | The Adjutant General | FEMA | |
| TAG | Threat Advisory Group | FEMA | |
| TAI | TSA Approved Instructor | TSA | |
| TAIS | Telecommunications and Automated Information Systems | FEMA | |
| TAOS | The Arbiter of Storms | FEMA | |
| TAP | Task Analysis Plan | FEMA | |
| TAPS | Trans-Alaska Pipeline System | FEMA | |
| TAR | Tone-Alert Radio | FEMA | |
| TARP | Troubled Asset Relief Program | FEMA | |
| TARS | Tethered Aerostat Radar System | ICE | |
| TARS | Tone-Alert Radios | FEMA | |
| TAS | Treasury account symbol | MGMT | |
| TAS | Treasury account symbol [financial] | MGMT | |
| TAT | Technical Assistance Team | FEMA | |
| TAV | Technical Assistance Visit (DPETAP/NDPC) | FEMA | |
| TAV | Total Asset Visibility | FEMA | |
| TAVISS | Targeted Violence Information Sharing System | TSA | |
| TBA | Thyroid Blocking Agent (see KI) | FEMA | |
| TBA | To be announced | DHS | |
| TBD | To be determined | DHS | |
| TBM | Temporary Bench Mark | FEMA | |
| TBP | To be published | OPA | |
| TBR | Travel Business Roundtable | TSA | |
| TC | Technical Committee | FEMA | |
| T-CAR | Tribal Capability Assessment for Readiness | FEMA | |
| TCC | TSA Telephone Contact Center | TSA | CRCL | |
| TCC | Tele-Communications Center | FEMA | |
| TCC | Telephone Contact Center | FEMA | |
| TCC | Traffic Control Center | FEMA | |
| TCC | Transportable Communications Center | FEMA | USCG | |
| TCD | Tropical Cyclone Discussion | FEMA | |
| TCL | Target Capabilities List | FEMA | |
| TCO | Territorial Coordinating Officer | FEMA | |
| TCOP | Tactical Common Operating Picture | FEMA | |
| TCP | Tele-Communications Priorities | FEMA | |
| TCP | Traffic Control Point | FEMA | |
| TCP | Transmission Control Protocol | FEMA | |
| TCR | Total Case Rate | FEMA | |
| TCS | (Standard Flood Hazard) Tracking and Correspondence System | FEMA | |
| TCS | Tactical Control System | FEMA | |
| TCU | Tribal Colleges and Universities | S&T | CRCL | |
| TCU | Threat Containment Unit | FEMA | |
| TCU | Transportation Coordination Unit | FEMA | |
| TCV | Total Containment Vessel | FEMA | |
| TDC | Theater Deployable Communications | FEMA | |
| TDC | Travel Document Checker | FEMA | |
| TDD | Telecommunications Device for the Deaf | CRCL | |
| TDFM | Traffic Demand Forecast Model | FEMA | |
| TDIS | Travel Document Issuance System | CBP | USCIS | I&A | PLCY | PRIV | |
| TDO | Typhoon Duty Officer | FEMA | |
| TDS | Time, Distance and Shielding | FEMA | |
| TDY | Temporary duty | DHS | |
| TEAM-CPR | Thermal, Etiological, Asphyxiation, Mechanical, Chemical, Psychological and Radioactive | FEMA | |
| TechStat | TechStat Accountability Session | MGMT | |
| TECS | Treasury Enforcement Communications System | CBP | TSA | I&A | |
| TED | Total Effective Dose | FEMA | |
| TEDE | Total Effective Dose Equivalent | FEMA | |
| TEEM | Training Excellence Emergency Management | FEMA | |
| TEEX | Texas Engineering Extension Service | FEMA | CISA | |
| TEI | Training and Exercise Integration (Division) | FEMA | |
| TEL | Transporter Erector Launcher | FEMA | |
| TELL | (Office of) Training, Exercises, and Lessons Learned | FEMA | |
| TELNET | Tele-conference Network | FEMA | |
| TEMA | Tennessee Emergency Management Agency | FEMA | |
| TEMCC | Tribal Emergency Management Coordinating Council | FEMA | |
| TEMP | Temporary Employee | FEMA | |
| TEMP | Test and Evaluation Master Plan | FEMA | |
| TENCAP | Tactical Exploitation of National Capabilities | I&A | |
| TEOAF | Treasury Executive Office of Asset Forfeiture | FLETC | |
| TEOC | Tele-Engineering Operations Center | FEMA | |
| TEOC | Transportation Emergency Operations Center | FEMA | |
| TEPD | Training, Education, and Professional Development | FEMA | |
| TERO | Tribal Employment Rights Organization | FEMA | |
| TERT | Telecommunicator Emergency Response Taskforce | FEMA | |
| TEU | twenty-foot equivalent unit | PLCY | |
| TEU | Technical Escort Unit | FEMA | |
| TEW | Terrorist Early Warning (Group) | FEMA | I&A | |
| TF | Task Force | FEMA | |
| TFAH | Trust for America’s Health | FEMA | |
| TFCC | Task Force Control Center | FEMA | |
| TFER | Task for Emergency Readiness | FEMA | |
| TFL | Task Force Leader | FEMA | |
| TFL | Temporary Fuel Location | FEMA | |
| TFLD | Task Force Leader | FEMA | |
| TFR | Temporary Flight Restriction | USSS | |
| TFS | Texas Forest Service | FEMA | |
| TFT | Temporary Full-Time | FEMA | |
| TH | Technological Hazards | FEMA | |
| TH | Temporary Housing | FEMA | |
| THA | Temporary Housing Assistance | FEMA | |
| THAMIC | Toxic Hazard Analysis Model for Industrial Chemicals | FEMA | |
| THC | Temporary Housing Checkwriter | FEMA | |
| THD | Technological Hazards Division | FEMA | |
| THIRA | threat and hazard identification and risk assessment | I&A | |
| THO | Temporary Housing Officer | FEMA | |
| THP | Temporary Housing Program | FEMA | |
| THREATCON | Threat Condition | FEMA | |
| THU | Temporary Housing Unit | FEMA | |
| TIA | Terrorism Information Awareness | DHS | |
| TIARA | Tactical Intelligence and Related Activities | I&A | |
| TIAS | Training Information Access System | FEMA | |
| TIB | toxic industrial biological | S&T | |
| TIB | Temporary Importation Bond | CBP | |
| TIC | Trusted Internet Connection | CISA | |
| TIC | Toxic Industrial Chemical | CISA | |
| TIC | toxic industrial material | S&T | |
| TICP | Tactical Interoperable Communications Plan | FEMA | |
| TIDE | Terrorist Identities Datamart Environment | I&A | OGC | PLCY | PRIV | |
| TIER | Treasury Information Executive Repository | FEMA | |
| TIFF | Tagged Image File Format | I&A | MGMT | |
| TIGER | Topologically Integrated Geographic Encoding and Reference (System) | FEMA | |
| TIH | Toxic Inhalation Hazard | TSA | S&T | |
| TIM | Toxic Industrial Material | FEMA | |
| TIMACS | Telecommunications Inventory Management and Control System | FEMA | |
| TIMS | Traffic Incident Management Systems | FEMA | |
| TIN | Taxpayer Identification Number | FEMA | |
| TIN | Triangular Irregular Network | FEMA | |
| TIOC | Transportation Information Operations Center | FEMA | |
| TIP | Threat Image Protection | TSA | |
| TIPOFF | Terrorism Information Program [database at DOS] | I&A | PLCY | |
| TIPS | Terrorism Information and Prevention System | FEMA | I&A | |
| TIR | toxic industrial radiological | S&T | |
| TIROS | Television and Infrared Observation Satellite | FEMA | |
| TISD | Transportation Infrastructure Security Division | FEMA | |
| TISP | The Infrastructure Security Partnership | CISA | PLCY | |
| TKB | Terrorism Knowledge Base | FEMA | |
| TL | Team Leader | FEMA | |
| TL | Truckload | FEMA | |
| TLC | Territory Logistics Centers | FEMA | |
| TLC-C | Territory Logistics Center- Central | FEMA | |
| TLC-E | Territory Logistics Center- East | FEMA | |
| TLC-W | Territory Logistics Center- West | FEMA | |
| TLD | Thermo Luminescent Dosimeter | FEMA | |
| TLO | Terminal Learning Objectives | FEMA | |
| TLS | Transport Layer Security | FEMA | |
| TLV | Threshold Limit Value | FEMA | |
| TM | Trademark | FEMA | |
| TMARS | Team Management and Rostering System | FEMA | |
| TMC | Transportation Management Center | FEMA | |
| TMC | Travel Management Center | FEMA | |
| TMI | Three Mile Island (Nuclear Power Plant) | FEMA | |
| TMS | Traffic Management Specialist | FEMA | |
| TMS | Training Management System | FEMA | |
| TMT | Traffic Management Team | FEMA | |
| TMT | Training Management Team | FEMA | |
| TNA | Training Needs Assessment | FLETC | |
| TNC | Terminal Node Controller | FEMA | |
| TNF | Technical Nuclear Forensics | CWMD | |
| TNSP | Training Specialist | FEMA | |
| TNT | Trinitrotoluene | FEMA | |
| TOA | Time of Arrival | FEMA | |
| TOA | Transportation Operating Agency | FEMA | |
| TOC | Table of Contents | FEMA | |
| TOC | Tactical Operations Center | FEMA | |
| TOC | Traffic Operations Center | FEMA | |
| TOCDF | Tooele Chemical Disposal Facility | FEMA | |
| TOI | track of interest | PLCY | |
| TOLC | Take-Off and Landing Coordinator | FEMA | |
| TOP | Technology Opportunities Program | FEMA | |
| TOPOFF | Top Officials Exercise | FEMA | CISA | |
| TOSC | Tactical On-Scene Commander | FEMA | |
| TOT | Time on Target | FEMA | |
| TP | Time Period | FEMA | |
| TPC | Tropical Prediction Center | FEMA | |
| TPED | Tasking, Processing, Exploitation and Dissemination | FEMA | |
| TPEP | Terrorism Prevention Exercise Program | FEMA | |
| TPFDD | Time-Phased Force Deployment Data | FEMA | |
| TPFDL | Time-Phased Force Deployment List | FEMA | |
| TPI | Two-Person Integrity | FEMA | |
| TPM | Trading Partner Management (system) | FEMA | |
| TPO | Technical Program Officer | FEMA | |
| TPO | Transition Planning Office | FEMA | |
| TPOC | Training Point of Contact | FEMA | |
| TPOP | Tractor Plow Operator | FEMA | |
| TPPB | Terrorism Production Planning Board (NCTC) | FEMA | |
| TPS | Temporary Protected Status | USCIS | OGC | |
| TR | Transportation Request | FEMA | |
| TRAC2ES | TRANSCOM’s Regulating and Command and Control Evacuation System | FEMA | |
| TRACEM | Thermal, Radioactive, Asphyxiation, Chemical, Etiological and Mechanical | FEMA | |
| TRADE | Training Resources and Data Exchange | FEMA | USFA | |
| TRADOC | United States Army Training and Doctrine Command | FEMA | |
| TRAGIS | Transportation Routing Analysis Geographic Information System | CISA | |
| TRAM | Transit Risk Assessment Methodology | FEMA | CISA | |
| TransCAER | Transportation Community Awareness Emergency Response | FEMA | |
| TRAVEL | Transportation Risk Assessment and Vulnerability Evaluation Tool | TSA | CISA | |
| TRC | Technology Review Committee | FEMA | |
| TRC | Telephone Response Center | FEMA | |
| TREAS | Department of the Treasury | DHS | |
| TRES | Department of Treasury (Federal Government) | FEMA | |
| TRI | Toxic Release Inventory | FEMA | |
| TRIA | Terrorism Risk Insurance Act | PLCY | |
| TRICS | Telephone to Radio Interface Communications System | FEMA | |
| TRIP | Transit (and) Rail Inspection Pilot | TSA | |
| TRIP | Traveler Redress Inquiry Program | TSA | |
| TRIPS | Travel Reporting and Information Processing System | FEMA | |
| TRM | Technical Reference Model | I&A | |
| TRO | Transient Accommodations Only | FEMA | |
| TRO | Transitional Recovery Office | FEMA | |
| TROPAN | Tropical Analysis Facsimile Network | FEMA | |
| TROR | Treasury Report on Receivables | FEMA | |
| TRP | Tactical Response Plan | FEMA | |
| TRPB | Tractor/Plow Boss | FEMA | |
| TRR | Test Readiness Review | S&T | |
| TRT | Tactical Response Team | FEMA | |
| TS | Thunderstorm | FEMA | |
| TS | Top Secret | DHS | |
| TS | Transfer System | FEMA | |
| TS | Tropical Storm | FEMA | |
| TS/SCI | Top Secret/Sensitive Compartmented Information | FEMA | |
| TSA | The Salvation Army | FEMA | |
| TSA | Transportation Security Administration | DHS | |
| TSAAC | Transportation Security Administration's Access Certificate | FEMA | |
| TSAC | Towing Safety Advisory Committee | USCG | |
| TSAR | Transportation Security Administration Representative | TSA | |
| TSARM | TSA Self-Assessment Risk Module | TSA | |
| TSB | Technical Services Branch | FEMA | |
| TSB | Training Support Brigade | FEMA | |
| TSC | Terrorist Screening Center | CBP | TSA | I&A | |
| TSC | Technical Support Center | FEMA | |
| TSC | Transportation Security Clearinghouse | FEMA | |
| TSCA | Toxic Substance Control Act | FEMA | |
| TSCC | Transportation Security Command Center | TSA | |
| TSCM | Technical Surveillance Countermeasures | TSA | |
| TSCM | Technical Security Countermeasure | FEMA | |
| TSCO | Top Secret Control Officer | FEMA | |
| TSD | Test and Evaluation Standards Division (S&T/TSD) | DHS | |
| TSDB | Terrorist Screening Database | CBP | I&A | PLCY | PRIV | |
| TSDN | Technical Support Data Notebook | FEMA | |
| TSDR | Toxic Substance and Disease Registry | FEMA | |
| TSGP | Transit Security Grant Program | FEMA | TSA | |
| TSI | national transportation security incident | PLCY | |
| TSI | Transportation Security Inspector | FEMA | |
| TSIS | Transportation Security Intelligence Service | TSA | I&A | |
| TSL | Transportation Security Laboratory | TSA | S&T | |
| TSN | Trade Support Network | FEMA | |
| TSNM | Transportation Sector Network Management (TSA/TSNM) | DHS | |
| TSO | Transportation Security Officer | TSA | |
| TSOC | Transportation Security Operations Center | TSA | |
| TSP | Thrift Savings Plan | MGMT | |
| TSP | Telecommunications Service Priority | FEMA | |
| TSP | Total Suspended Particulates | FEMA | |
| TSP | Training Support Package | FEMA | |
| TSP | Transit Security Program | FEMA | |
| TSPSOC | Telecommunications Service Priority/System Oversight Committee | FEMA | CISA | |
| TSR | Telecommunications Service Request | FEMA | |
| TSR | Teleregistration Service Representative | FEMA | |
| TSS | Temporary Storage Site | FEMA | |
| TSSP | Transportation Sect Specific Plan | TSA | |
| TSWA | Temporary Secure Working Area | FEMA | |
| TSWG | Technical Support Working Group | FEMA | |
| TT | Travel Trailer | FEMA | |
| TT&E | Test, Training and Exercise | FEMA | |
| TTAC | Terrorist Threat Assessment and Credentialing | TSA | |
| TTC | Technical Training Center | FEMA | |
| TTC | Time To Complete | FEMA | |
| TTD | see TDD | CRCL | |
| TTF | Terrorism Task Force | FEMA | |
| TTIC | Terrorist Threat Integration Center | I&A | |
| TTP | Tactics, Techniques and Procedures | I&A | |
| TTPP | Transportation Threat Protection Program | FEMA | |
| TTT | Train the Trainer | FEMA | |
| TTWS | Terrorist Threat Warning System | OPS | |
| TTX | Tabletop Exercise | FEMA | CISA | |
| TTY | see TDD | CRCL | |
| TUAV | Tactical Unmanned Aerial Vehicle | FEMA | |
| TUH | Two Unit Housing | FEMA | |
| TUSCAN | TIPOFF United States-Canada | I&A | PLCY | |
| TUTT | Tropical Upper Tropospheric Trough | FEMA | |
| TV | Television | FEMA | |
| TV | Thomasville, Georgia | FEMA | |
| TVA | Tennessee Valley Authority | DHS | |
| TVIS | Threat Vulnerability Integration System | FEMA | |
| TVM | Threat-Vulnerability Mapper | FEMA | |
| TVTA | Threat and Vulnerability, Testing and Assessment | S&T | |
| TWA | Time Weighted Average | FEMA | |
| TWD | Tropical Weather Discussion | FEMA | |
| TWG | Technical Working Group | FEMA | |
| TWG | Terrorist Working Group | FEMA | |
| TWIC | Transportation Worker Identification Credential | TSA | PLCY | PRIV | |
| TWOV | Transit Without Visa Program | TSA | |
| TWPDES | Terrorist Watchlist Person Data Exchange Standard | I&A | PLCY | |
| TWVP | (see TWOV) | TSA | |
| U.S. | United States (also US) | FEMA | |
| UA | Unauthorized Absence | FEMA | |
| UA | Universal Adversary | FEMA | |
| UA | Upper Air | FEMA | |
| UAC | Unified Area Command | FEMA | |
| UAM | user activity monitoring | I&A | |
| UASI | Urban Areas Security Initiative | FEMA | |
| UAV | Unmanned Aerial Vehicle (drone) | CBP | FEMA | CWMD | |
| UAV ESG | UAV Executive Steering Group | FEMA | |
| UAWG | Urban Area Working Group | FEMA | |
| UBC | Uniform Building Code | FEMA | |
| UBE | unknown bulk explosive | S&T | |
| UBR | Universal Business Registry | FEMA | |
| UC | Unemployment Compensation | FEMA | |
| UC | Unified Command | FEMA | |
| UC/IC | Unified Command / Incident Command | FEMA | |
| UCC | Unified Combatant Command | FEMA | |
| UCGIS | University Consortium for Geographic Information Science | FEMA | |
| UCP | Unified Command Plan | FEMA | |
| UCP | Unified Command Post | FEMA | |
| UCS | Unified Command System | FEMA | |
| UCT | Unified Command Team | FEMA | |
| UCT | Universal Coordinated Time (see ZULU) | FEMA | S&T | |
| UD | Unified Defense | FEMA | |
| UDA | Undocumented Aliens | ICE | |
| UDDI | Universal Description, Discovery, and Integration | FEMA | |
| UDP | Urban Dispersion Program | FEMA | |
| UEC | Unauthorized Entry into Cuban Territorial Waters | USCG | |
| UEL | Upper Explosive Limit | FEMA | |
| UF6 | Uranium Hexafluoride | FEMA | |
| UGC | Universal Generic Code | FEMA | |
| UHF | Ultra High Frequency | FEMA | |
| UI | Unemployment Insurance | FEMA | |
| UIC | Unified Incident Command | FEMA | |
| UICDS | Unified Incident Command and Decision Support | FEMA | |
| UJTL | Universal Joint Task List | FEMA | |
| UL | Underwriters Laboratories | FEMA | |
| ULD | Unit Loading Device | FEMA | |
| ULF | Ultra Low Frequency | FEMA | |
| ULN | Unit Line Number | FEMA | |
| ULO | Unliquidated Obligation | FEMA | |
| ULP | Unfair Labor Practice | FEMA | |
| UMCA | Umatilla Chemical Activity | FEMA | |
| UMCD | Umatilla Chemical Depot | FEMA | |
| UMCOR | United Methodist Committee on Relief | FEMA | |
| UMD | University of Maryland | FEMA | |
| UMDA | Umatilla Depot Activity | FEMA | |
| UML | Unified Modeling Language | I&A | MGMT | PLCY | |
| UMOC | Unified Medical Operations Center | FEMA | |
| UMP | Upward Mobility Program | FEMA | |
| UMRA | Unfunded Mandates Reform Act [1995] | OGC | |
| UN | United Nations | FEMA | PLCY | |
| UNC | Universal Naming Convention | FEMA | |
| UNCLASS | Unclassified | FEMA | |
| UNDRO | United Nations Disaster Relief Organization | FEMA | |
| UNGA 62 | 62nd Meeting of the United Nations General Assembly | FEMA | |
| UNHCR | United Nations High Commissioner for Refugees | FEMA | |
| UNP | Unmet Needs Program | FEMA | |
| UNSCOM | United Nations Special Commission | FEMA | |
| UO2F2 | Uranyl Fluoride | FEMA | |
| UOC | USACE Operations Center | FEMA | |
| UOM | Unit Of Measure | FEMA | |
| UPC | Universal Product Code | FEMA | |
| UPR | User Profile Record | I&A | MGMT | |
| UPS | Uninterruptible Power Supply | FEMA | |
| UPS | United Postal Service | FEMA | |
| URA | Uniform Relocation Act | FEMA | |
| URGENT | Uniform Regional Guidance Employing National Teams | FEMA | |
| URI | Upper Respiratory Infection | FEMA | |
| URISA | Urban and Regional Information Systems Association | FEMA | |
| URL | Uniform Resource Locator | FEMA | I&A | MGMT | |
| US | Under Secretary (also U/S) | FEMA | |
| US&R | Urban Search & Rescue (see also USAR) | FEMA | |
| USA | United States Army | FEMA | USCG | |
| USA | United States of America | FEMA | |
| USA PATRIOT [Act] | Uniting & Strengthening America by Providing Appropriate Tools Required to Intercept & Obstruct Terrorism | DHS | |
| USA; US | United States of America [geographical] | DHS | |
| USACBDC | United States Army Chemical and Biological Defense Command | DHS | FEMA | |
| USACDA | United States Arms Control and Disarmament Agency | DHS | FEMA | |
| USACDRA | United States Army Chemical Demilitarization and Remediation Activity | DHS | FEMA | |
| USACE | United States Army Corps of Engineers | DHS | |
| USACHPPM | United States Army Center for Health Promotion and Preventive Medicine | DHS | FEMA | |
| USACMDA | United States Army Chemical Material Destruction Agency | DHS | FEMA | |
| USACOM | United States Atlantic Command (see USJFCOM) | DHS | FEMA | |
| USADACS | United States Army Defense Artillery Center and School | DHS | FEMA | |
| USAF | United States Air Force | DHS | FEMA | USCG | |
| USAFA | United States Air Force Academy | DHS | ICE | |
| USAHA | United States Animal Health Association | DHS | S&T | |
| USAID | United States Agency for International Development | DHS | |
| USAISC | United States Army Information Systems Command | DHS | FEMA | |
| USA-ITA | United States Association for Importers of Textiles and Apparel | CBP | |
| USAMRAA | United States Army Medical Research Acquisition Activity | DHS | FEMA | |
| USAMRICD | United States Army Medical Research Institute of Chemical Defense | DHS | FEMA | CISA | CWMD | |
| USAMRIID | United States Army Medical Research Institute for Infectious Disease | DHS | FEMA | CISA | CWMD | |
| USANCA | United States Army Nuclear and Chemical Agency | DHS | FEMA | |
| USAR | United States Army Reserve | DHS | FEMA | |
| USAR | Urban Search and Rescue | FEMA | |
| USBP (see CBP) | United States Border Patrol | DHS | CBP | |
| USBR | United States Bureau of Reclamation | DHS | FEMA | |
| USC | United States Citizen | DHS | CBP | USCIS | |
| USC | United States Code | DHS | FEMA | CISA | I&A | |
| USCAP | United States Civilian Aviation Partnership | DHS | PLCY | |
| US-CERT | United States Computer Emergency Readiness Team | DHS | CISA | S&T | I&A | |
| USCG | U.S. Coast Guard | DHS | MGMT | |
| USCG | United States Coast Guard | DHS | |
| USCGR | United States Coast Guard Reserve | DHS | FEMA | |
| USCIRF | United States Commission of International Religious Freedom | DHS | FEMA | |
| USCIS | U.S. Citizenship and Immigration Services | DHS | USCIS | |
| USCM | United States Conference of Mayors | DHS | FEMA | |
| USCOLD | United States Committee on Large Dams | FEMA | |
| USCP | United States Capitol Police | DHS | FEMA | |
| USCS (see CBP) | United States Customs Service (now U.S. Customs and Border Protection) | DHS | FEMA | |
| USCSCFAC | United States Customs Service COBRA Fees Advisory Committee | DHS | CBP | |
| USDA | United States Department of Agriculture | DHS | |
| USDA/CSREES | United States Department of Agriculture/ Cooperative State Research, Education and Extension Service (aka: "the Extension Service") | DHS | FEMA | |
| USDOI | United States Department of the Interior | DHS | FEMA | |
| USDOL | United States Department of Labor | DHS | FEMA | |
| USDOT | United States Department of Transportation [ESF-1] | DHS | FEMA | |
| USET | United South and Eastern Tribes | DHS | FEMA | |
| USFA | United States Fire Administration (FEMA/USFA) | DHS | |
| USFS | United States Forest Service | DHS | FEMA | |
| USFWS | United States Fish and Wildlife Service | DHS | FEMA | |
| USG | United States Government | DHS | FEMA | |
| USGS | United States Geological Survey | DHS | FEMA | CISA | |
| USGS-DLG | United States Geological Survey Digital Line Graph (Format) | DHS | FEMA | |
| USIA | Under Secretary for Intelligence and Analysis | I&A | |
| USIA | United States Information Agency | DHS | FEMA | |
| USIC | United States Interdiction Coordinator | DHS | ICE | |
| USITC | United States International Trade Commission | DHS | FEMA | |
| USJFCOM | United States Joint Forces Command | DHS | FEMA | USCG | |
| USMC | United States Marine Corps | DHS | FEMA | USCG | |
| USMCR | United States Marine Corps Reserve | DHS | FEMA | |
| USML | United States Munitions List | FEMA | |
| USMRICD | United States Army Medical Research Institute of Chemical Defense | FEMA | |
| USMS | United States Marshals Service | DHS | CBP | FEMA | ICE | TSA | |
| USMTF | United States Message Text Format | DHS | FEMA | |
| USN | United States Navy | DHS | FEMA | USCG | |
| USNCB | United States National Central Bureau | I&A | |
| USNG | United States National Grid (NAD83) | FEMA | |
| USNG | United States National Guard | FEMA | |
| USNORTHCOM | see NORTHCOM | DHS | FEMA | |
| USNR | United States Naval Reserve | DHS | FEMA | |
| USOC | United States Olympic Committee | DHS | FEMA | |
| USP | Under Secretary for Preparedness | FEMA | |
| USPACOM | United States Pacific Command | DHS | FEMA | |
| USPHS | United States Public Health Service | DHS | FEMA | S&T | |
| USPIS | United States Postal Inspection Service | DHS | CISA | |
| USPP | United States Park Police | DHS | FEMA | |
| USPS | United States Postal Service | DHS | |
| USS | United States Senate | DHS | FEMA | |
| USS | United States Ship | DHS | FEMA | |
| USSOCOM | United States Special Operations Command | DHS | FEMA | |
| USSOUTHCOM | United States Southern Command | DHS | FEMA | |
| USSPACECOM | United States Space Command | DHS | FEMA | |
| USSS | U.S. Secret Service | DHS | USSS | MGMT | |
| USSS | United States Secret Service | DHS | USSS | |
| USSTRATCOM | United States Strategic Command | DHS | FEMA | |
| UST | Underground Storage Tank | FEMA | |
| USTR | United States Trade Representative | DHS | |
| USTRANSCOM | United States Transportation Command | DHS | FEMA | |
| USVI | United States Virgin Islands | DHS | FEMA | |
| US-VISIT | United States Visitor and Immigrant Status Indicator Technology (NPPD/US-VISIT) | DHS | |
| UTC | Unit Type Code | FEMA | |
| UTC | Universale Temps Coordinaire (i.e., Coordinated Universal Time) | FEMA | |
| UTCP | Unified Tactical Communications Program | DHS | |
| UTL | Universal Task List | FEMA | |
| UTM | Universal Transverse Mercator | FEMA | |
| UUV | Unmanned Underwater Vehicle | S&T | |
| UV | Ultraviolet | FEMA | |
| UVI | Ultraviolet Index | FEMA | |
| UVIED | under vehicle improvised explosive device employment | S&T | |
| UWB | Ultra Wideband | CISA | |
| UXO | unexploded ordnance | S&T | |
| v | volt | FEMA | |
| V | Voltage | FEMA | |
| VA | United States Department of Veterans Affairs | DHS | |
| VA | Vulnerability Assessment | FEMA | |
| VACF | Vetted Anti-Counterfeiting Forces | USSS | |
| VACIS | Vehicle and Cargo Inspection System | CBP | |
| VADM | Vice Admiral | FEMA | |
| VAERS | Vaccine Adverse Event Reporting System | FEMA | |
| VAL | Validation | FEMA | |
| VAL | Voluntary Agency Liaison | FEMA | |
| VAMC | Veteran’s Administration Medical Center | FEMA | |
| VAX | Virtual Address Extension | FEMA | |
| VBIED | Vehicle Borne Improvised Explosive Device | S&T | |
| VCC | Venue Control Cell | FEMA | |
| VCOS | Volunteer Chief Officer Section | FEMA | |
| VCR | Video Cassette Recorder | FEMA | |
| VCU | VOLAG Coordination Unit | FEMA | |
| VDEM | Virginia Department of Emergency Management | FEMA | |
| VDU | Visual Display Unit | FEMA | |
| VDU | Visual Docking Unit | FEMA | |
| VEDS | Vehicular Emergency Data Set | FEMA | |
| VEE | Venezuelan Equine Encephalitis | FEMA | |
| VEI | Volcanic Explosivity Index | FEMA | |
| VERA | Voluntary Early Retirement Authority | FEMA | |
| VFD | Volunteer Fire Department | FEMA | |
| VFR | Visual Flight Rules | FEMA | |
| VGA | Video Graphics Adapter | FEMA | |
| VGTOF | Violent Gangs Terrorist Organization File | I&A | PLCY | |
| VHA | Veterans Health Administration | FEMA | USCG | |
| VHF | Very High Frequency | FEMA | |
| VI | Virgin Islands | FEMA | |
| VIA | By way of | FEMA | |
| VIG | Vaccinia Immuno Globulin | FEMA | |
| VIK | Value in Kind | FEMA | |
| VIP | Very important person | DHS | |
| VIP | Volunteer Incentive Program | FEMA | |
| VIPR | Visible Intermodal Prevention and Response Team | OPS | |
| VIPR | Visual Intermodal Protection and Response | TSA | S&T | |
| VIPS | Volunteers in Police Service | FEMA | CISA | |
| VISAT | Vulnerability Identification Self-Assessment Tool | CISA | |
| VISAT | Vulnerability Identification Self-Assessment Tool (now RSAT) | FEMA | |
| VISC | Visual Information Support Center | FEMA | |
| VISIT | Visitor & Immigrant Status Indicator Technology | CBP | TSA | USCIS | |
| VISN | Veteran's Integrated Services Network | FEMA | |
| VISTA | Volunteers in Service to America | FEMA | |
| VITA | Volunteers in Technical Assistance | FEMA | |
| VITEMA | Virgin Islands Territorial Emergency Management Agency | FEMA | |
| VLF | Very Low Frequency | FEMA | |
| VLN | Virtual LAN | FEMA | |
| VLSI | Very Large Scale Integration | FEMA | |
| VMAS | Vertical Map Accuracy Standard | FEMA | |
| VMAT | Veterinary Medical Assistance Team | FEMA | OPS | |
| VMC | Virtual Model Community | FEMA | |
| VMI | Vendor Managed Inventory | FEMA | |
| VMO | Veterinary Medical Officer | FEMA | |
| VMS | Virtual Memory System | FEMA | |
| VNN | Virtual News Network | FEMA | |
| VNPSC | Virginia National Processing Service Center | FEMA | |
| VOA | Volunteers of America | FEMA | |
| VOAD | Volunteer Organizations Active in a Disaster | PLCY | |
| VOIED | victim operated switch | S&T | |
| VOIP | Voice Over Internet Protocol | S&T | I&A | MGMT | PLCY | PRIV | |
| VOLAG | Voluntary Agency | FEMA | |
| VOR | Visual Omni Ranger | FEMA | |
| VORTEX | Verification of the Origin of Rotation in Tornadoes Experiment | FEMA | |
| VOSS | Vessel of Opportunity Skimming System | USCG | |
| VPF | Vector Product Format | FEMA | |
| VPN | Virtual Private Network | I&A | MGMT | |
| VR | Virtual Reality | FEMA | |
| VRC | Volunteer Reception Center | FEMA | |
| VRI | video remote interpreting service | CRCL | PRIV | |
| VRML | Virtual Reality Modeling Language | FEMA | |
| VRP | Vessel Response Plan | FEMA | |
| VS | Veterinary Services | FEMA | |
| VS | Victim Support | FEMA | |
| VSAB | Vehicle Storage Administration Building | FEMA | |
| VSL | value of statistical life | PLCY | |
| VSP | Visa Security Program | TSA | |
| VST | Victim Support Task | FEMA | |
| VSU | Visa Security Unit | ICE | |
| VTC | Video Tele-Conference | FEMA | OPA | |
| VTS | Vessel Traffic Service | USCG | |
| VWP | Visa Waiver Program | CBP | ICE | TSA | |
| VWPPA | Visa Waiver Permanent Program Act of 2000 | FEMA | |
| V-Zone | Coastal High Hazard Area | FEMA | |
| w | watt | FEMA | |
| W | Wattage | FEMA | |
| W/COMB | With Combination | FEMA | |
| W/LK | With Lock | FEMA | |
| W/M | With Monitor | FEMA | |
| W/SH | With Shelves | FEMA | |
| WACC | Weapons and Ammunition Commodity Council | USCG | USSS | |
| WAE | When Actually Employed | FEMA | |
| WAN | Wide Area Network | FEMA | |
| WAPA | Western Area Power Administration (part of DOE) | FEMA | |
| WAR | Weekly Activity Report | FEMA | |
| WARN | Web Alert & Relay Network | FEMA | |
| WARNO | Warning Order | FEMA | |
| WARP | Web Audit and Remediation Program | FEMA | |
| WASS | Wide Area Surveillance System | FEMA | |
| WATS | Wide Area Telecommunications Service | FEMA | |
| WAWAS | Washington Area Warning System | FEMA | |
| WAWS | Washington Area Warning System | FEMA | |
| WAWTAP | Wind And Water Technical Assistance Program | FEMA | |
| WB | Whole Body | FEMA | |
| WB | Wideband | FEMA | |
| WBIED | water-borne improvised explosive device | S&T | |
| WBS | work breakdown structure | S&T | |
| WBS activity | work breakdown schedule activity | MGMT | |
| WBT | Web-Based Training | FEMA | |
| WC | Wet Chemical | FEMA | |
| WCATWC | West Coast & Alaska Tsunami Warning Center | FEMA | |
| WCF | Working Capital Fund | I&A | MGMT | |
| WCO | World Customs Organization | CBP | |
| WEB-TA | Web-based Time and Attendance | FEMA | |
| WEE | Western Equine Encephalitis | FEMA | |
| WEF | World Economic Forum | PLCY | |
| WEF | Water Environment Federation | FEMA | |
| WELP | Women’s Executive Leadership Program | FEMA | |
| WEM | Workshop in Emergency Management | FEMA | |
| WER | Weapons-Effect Reporting | FEMA | |
| WERT | Wireless Emergency Response Team | FEMA | |
| WFLC | Wildland Fire Leadership Council | FEMA | |
| WFS | Women in the Fire Service, Inc. (see IWOMEN) | FEMA | |
| WFSA | Wildland Fire Situation Analysis | FEMA | |
| WFU | Wildland Fire Use | FEMA | |
| WG | Wage Grade | FEMA | |
| WG | Working Group | FEMA | |
| WGA | Western Governors’ Association | FEMA | |
| WGI | Within Grade Increase | MGMT | |
| WH | Warehouse | FEMA | |
| WH | White House | FEMA | |
| WHCA | White House Communications Agency | FEMA | |
| WHITCU | White House Initiative for Tribal Colleges and Universities | FEMA | |
| WHL | White House Liaison Office (SEC/COS/WHL) | DHS | |
| WHLO | White House Liaison Office | FEMA | |
| WHMO | White House Military Office | FEMA | |
| WHO | White House Office | DHS | |
| WHO | World Health Organization | FEMA | CISA | OGC | CWMD | |
| WHP | White House Package | FEMA | |
| WHS | Washington Headquarters Services | FEMA | |
| WHSR | White House Situation Room | FEMA | CISA | I&A | |
| WHTI | Western Hemisphere Travel Initiative | CBP | CISA | PLCY | PRIV | |
| WIFLE | Women in Federal Law Enforcement | FLETC | MGMT | |
| WIMS | Weather Information Management System | FEMA | |
| WIN | Warrant Information Network | I&A | PLCY | PRIV | |
| WIN | WWMCCS Inter-computer Network | FEMA | |
| WISE | Water Infrastructure Simulation Environment | CISA | |
| WITS | Washington Interagency Telecommunications System | FEMA | |
| WJIIP | Windows Joint Instructional Input Program | FEMA | |
| WKS | Worksheet | FEMA | |
| WLANs | wireless local area networks | FEMA | |
| WLSP | Watch List Service Providers | TSA | |
| WM | Warehouse Management (system) | FEMA | |
| WM | Water Mist | FEMA | |
| WMA | Washington Metropolitan Area | FEMA | |
| WMATA | Washington Metropolitan Area Transport Authority | FEMA | |
| WMD | Water Management District | FEMA | |
| WMD | Weapons of Mass Destruction | FEMA | CISA | S&T | CWMD | I&A | |
| WMD COP | Weapons of Mass Destruction Common Operational Picture | FEMA | |
| WMD detection technology | weapon of mass destruction detection technology | DHS | |
| WMDBD | WMD and Biodefense (OHA/WMDBD) | DHS | |
| WMD-DAC | WMD Decision Analysis Center | S&T | |
| WMD-MCM | Weapons of Mass Destruction Medical Countermeasures | FEMA | |
| WMDO-IM | Weapons of Mass Destruction Office & Incident Management | S&T | |
| WMDOU | Weapons of Mass Destruction Operations Unit (FBI) | FEMA | |
| WMF | Windows Metafile | FEMA | |
| WMO | World Meteorological Organization | FEMA | CISA | |
| WO | Warrant Officer | FEMA | |
| WO | Washington Office (District of Columbia office for NORAD-USNORTHCOM) | FEMA | |
| WO | Work Order | FEMA | |
| WOBS | Weather Observer | FEMA | |
| WORM | Write Once - Read Many (CD-ROM Drive) | FEMA | |
| WOSB | Woman Owned Small Business | FEMA | |
| WP | Warning Point | FEMA | |
| WP | White Phosphorus | FEMA | |
| WP | Word Processing (or) | FEMA | |
| WP | Work Packet | FEMA | |
| WPL | Worker Population Limit | FEMA | |
| WPM | Wood Packing Material | CBP | |
| WPS | Wireless Priority Service | CISA | I&A | |
| WPS | Water Purification System | FEMA | |
| WPS | Word Processing System | FEMA | |
| WPT | Workforce Performance Training | TSA | |
| WRC | Weapons Recovery Center | FEMA | |
| WRDA | Water Resources Development Act | FEMA | |
| WRF | Weather Research and Forecasting | FEMA | |
| WRIST | Weather Radar Identification of Severe Thunderstorms | FEMA | |
| WRM | War Reserve Material | FEMA | |
| WRS | Wreck Removal and Salvage | FEMA | |
| WRSAME | Weather Radio Specific Area Message Encoding | FEMA | |
| WS | Wildlife Services | FEMA | |
| WSDA | Washington State Department of Agriculture | FEMA | |
| WSDE | Washington State Department of Ecology | FEMA | |
| WSDH | Washington State Department of Health | FEMA | |
| WSDIS | Washington State Department of Information Services | FEMA | |
| WSDL | Web Services Description Language | I&A | MGMT | |
| WSDOT | Washington State Department of Transportation | FEMA | |
| WSE | Web Service Enhancement | FEMA | |
| WSEL | Water-Surface Elevation | FEMA | |
| WSEMD | Washington State Emergency Management Department | FEMA | |
| WSF | Washington State Ferries | FEMA | |
| WSP | Washington State Patrol | FEMA | |
| WSR | Weather Surveillance Radar | FEMA | |
| WSSPC | Western States Seismic Policy Council | FEMA | |
| Wt | Weight | FEMA | |
| WTA | willingness-to-accept | PLCY | |
| WTC | World Trade Center | FEMA | |
| WTI | weapons technical intelligence | S&T | |
| WTO | World Trade Organization | FEMA | CISA | I&A | |
| WTP | willingness-to-pay | PLCY | |
| WUI | Wildland-Urban Interface | FEMA | |
| WVOES | West Virginia Office of Emergency Services | FEMA | |
| WWL | Wind/Water Line | FEMA | |
| WWMCCS | World Wide Military Command and Control System (see GCCS) | FEMA | |
| WWU | Watch and Warning Unit | FEMA | |
| WWW | Web | OPA | |
| WWW | World Wide Web | FEMA | |
| WYO | Write Your Own (Insurance, e.g., NFIP) | FEMA | |
| WYOP | Write Your Own Program | FEMA | |
| WYSIWYG | What You See Is What You Get | FEMA | |
| XDA | Existing Data Study | FEMA | |
| XEDO | Xedar Heat Detection Unit | FEMA | |
| XL | Extra Large | FEMA | |
| XML | Extensible Markup Language | I&A | MGMT | |
| XPA | Extent of Play Agreement | FEMA | |
| XS | Extra Small | FEMA | |
| XSTF | XML Structure Task Force | FEMA | |
| YCC | Youth Conservation Corps | FEMA | |
| yd | yard | FEMA | |
| YLD | Yield | FEMA | |
| YLD | Young Lawyers Division | FEMA | |
| yr | year | FEMA | |
| YTD | Year To Date | FEMA | |
| Z | Zulu (UTC) | FEMA | |
| ZBB | Zero-Based Budgeting | FEMA | |
| ZECP | Zone Emergency Communications Planner | FEMA | |
| ZFP | Zone Forecast Product | FEMA | |
| ZIP | Zoning Improvement Plan | FEMA | |
| ZONE A | Special Flood Hazard Area inundated by the 100-year flood; base flood elevations are not determined (AE as well as A1-30 included) | FEMA | |
| ZONE A99 | Special Flood Hazard Area inundated by the 100-year flood to be protected from the 100-year flood by a Federal flood protection system under construction; base flood elevations are not determined | FEMA | |
| ZONE AH | Special Flood Hazard Area inundated by the 100-year flood; flood depths of 1 to 3 feet (usually areas of ponding); base flood elevations are determined | FEMA | |
| ZONE AO | Special Flood Hazard Area inundated by the 100-year flood; with flood depths of 1 to 3 feet (usually sheet flow on the sloping terrain); average depths are determined. For areas of alluvial fan flooding, velocities are also determined | FEMA | |
| ZONE AR | Special Flood Hazard Area that results from the decertification of a previously accredited flood protection system that is in the process of being restored to provide a 100-year or greater level of flood protection | FEMA | |
| ZONE B | Area of 500-year flood; area subject to the 100-year flood with average depths of less than 1 foot or with contributing drainage area less than one square mile; and areas protected by levees from the base flood | FEMA | |
| ZONE C | Area determined to be outside the 500-year floodplain | FEMA | |
| ZONE D | Area in which flood hazards are undetermined | FEMA | |
| ZONE V | Special Flood Hazard Area inundated by the 100-year flood; coastal floods with velocity hazards (wave action); base flood elevations are not determined (VE as well as V1-30 included) | FEMA | |
| ZONE X | If shaded: Area of 500-year flood; area subject to the 100-year flood with average depths of less than 1 foot or with contributing drainage area less than one square mile; and areas protected by levees from the base flood | FEMA | |
| ZONE X | If unshaded: Area determined to be outside the 500-year floodplain | FEMA | |
| ZULU | Indicates use of Universal Coordinated Time (Greenwich) | FEMA | CISA | |
| ZWA | Zonal Wind Anomaly | FEMA | |