| Abbreviation | Definition |
|---|---|
| AT | Access Type |
| AT | Acquisition Team |
| AT | Air Transport |
| AT | Alert Time |
| AT | Annual Training |
| AT | Anti-Tank |
| AT | Antiterrorism |
| AT | Army Transformation |
| AT | Army Troops |
| AT | Army Truck |
| At | Total Attainable Search Area |
| AT/FP | Anti-Terrorism/Force Protection |
| AT-2 | Swatter Missile |
| AT-4 | Spigot Missile |
| AT-5 | Spandrel Missile |
| AT-6 | Spiral Missile |
| AT-8 | Songster Missile |
| ATA | Airlift Tanker Association |
| ATA | Anti-Tank Assault |
| ATA | Army Technical Architecture |