| ACS | Automated Case Support System |
| ADIC | Assistant Director in Charge |
| ASAC | Assistant Special Agent in Charge |
| ATAC | Anti-Terrorism Advisory Council |
| ATF | Bureau of Alcohol, Tobacco, Firearms, and Explosives |
| ATTF | Anti-Terrorism Task Force |
| AUSA | Assistant United States Attorney |
| BOP | Federal Bureau of Prisons |
| CBP | Customs and Border Protection,
U.S. Department of Homeland Security |
| CIA | Central Intelligence Agency |
| CIFA | Counterintelligence Field Activity, Department of Defense |
| CRM | Criminal Division, U.S. Department of Justice |
| CTS | Counterterrorism Section, Criminal Division,
U.S. Department of Justice |
| DEA | Drug Enforcement Administration |
| DHS | U.S. Department of Homeland Security |
| DOD | Department of Defense |
| EARS | Evaluation and Review Staff, EOUSA |
| EOUSA | Executive Office for United States Attorneys |
| FBI | Federal Bureau of Investigation |
| FISA | Foreign Intelligence Surveillance Act |
| FTTTF | Foreign Terrorist Tracking Task Force |
| FY | Fiscal Year |
| GAO | Government Accountability Office |
| ICE | Immigration and Customs Enforcement,
U.S. Department of Homeland Security |
| IDW | Investigative Data Warehouse |
| INS | Immigration and Naturalization Service |
| JMD | Justice Management Division |
| JTTF | Joint Terrorism Task Force |
| LECC | Law Enforcement Coordinating Committee |
| LEO | Law Enforcement Online |
| LESC | Law Enforcement Support Center |
| MOU | Memorandum of Understanding |
| NCTC | National Counterterrorism Center |
| NJTTF | National Joint Terrorism Task Force |
| NLETS | National Law Enforcement Telecommunication System |
| NSCC | National Security Coordination Council |
| NYPD | New York City Police Department |
| ODAG | Office of the Deputy Attorney General,
U.S. Department of Justice |
| OIG | Office of the Inspector General, Department of Justice |
| OIPR | Office of Intelligence Policy and Review |
| RAO | Resident Agency Office |
| RTTF | Regional Terrorism Task Force |
| SAC | Special Agent in Charge |
| SEVIS | Student and Exchange Visitor Information System |
| SCIF | Sensitive Compartmented Information Facility |
| SSA | Supervisory Special Agent |
| TFOS | Terrorist Financing Operations Section |
| TSA | Transportation Security Administration,
U.S. Department of Homeland Security |
| TSC | Terrorist Screening Center |
| TTIC | Terrorist Threat Integration Center |
| TURK | Time Utilization and Recordkeeping System |
| US-VISIT | United States Visitor and Immigrant Status
Indicator Technology |
| USAO | United States Attorney's Office |
| USMS | U.S. Marshals Service |
| VGTOF | Violent Gang and Terrorist Organization File |
| WMD | Weapons of Mass Destruction |
