| Abbreviation | Definition |
|---|---|
| ATARS | Advanced Tactical Airborne Reconnaissance System |
| ATAS | Advanced Tank Armament System |
| ATAS | Air-To-Air Stinger |
| ATAT | All Terrain Armored Transport |
| AT-AT | All-Terrain Armored Transport |
| ATB | Active Time Bar |
| ATB | Active Time Battle |
| ATB | Advanced Technology Bomber |
| ATB | Advanced Training Base |
| ATB | Anti-Tank Battalion |
| ATB | Aviation Test Board |
| ATBIP | Aviation Thermobaric Bomb of Increased Power |
| ATBM | Air Tanker Base Manager |
| ATBM | Anti Tactical Ballistic Missile |
| ATBM | Anti-Tactical Ballistic Missile |
| ATC | Aberdeen Test Center |
| ATC | Active Training Cell |
| ATC | Advanced Training Cadet |
| ATC | Air Threat Conference |
| ATC | Air Traffic Control |