| Abbreviation | Definition |
|---|---|
| ATB | Across The Board |
| ATBCB | Architectual and Transportation Barriers Compliance Board |
| ATCU | Advanced Threat Containment Unit |
| ATF | Allied Tactical Force |
| ATF | Alochol Tobbaco and Firearms |
| ATF | Anti-Terrorist Financing |
| ATF | Bureau of Alcohol, Tobacco, Firearms, and Explosives |
| ATFE | Alcohol Tobacco Firearms and Explosives |
| ATFP | Anti Terrorism And Force Protection |
| ATFP | Arab Trade Financing Program |
| ATFT | Always Tit For Tat |
| ATIC | Air Technical Intelligence Center |
| ATO | Anti Terrorist Organization |
| ATSC | Advanced Television Systems Committee |
| ATSDR | Agency for Toxic Substance and Disease Registry |
| ATSDR | Agency for Toxic Substances Disease Registry |
| ATSDR | Agency for Toxic Substances & Disease Registry |
| ATSDR | Agency for Toxic Substances and Disease Registry |
| ATTF | Anti Terrorism Task Force |
| ATTF | Anti-Terrorism Task Force |