| Abbreviation | Definition |
|---|---|
| AC | armed conflict |
| AC | Armor Class |
| AC | Armored Class |
| AC | Armored Convoy |
| AC | Armored Corps |
| AC | Army Cadet |
| AC | Army Company |
| AC | Army Component |
| AC | Assessment Center |
| AC | Attack City |
| AC | Authorize Capture |
| AC | Automation and Communications |
| AC/RC | Active Component/Reserve Component |
| AC/RC | Active Components/Reserve Components |
| AC-130 | Spectre gunship based on the C-130 cargo aircraft |
| AC2 | Airspace Command and Control |
| AC2F | Automated Command and Control Facility |
| AC2MP | Army Command and Control Master Plan |
| AC2P | Advanced Command and Control Program |
| ACA | Advanced Cargo Aircraft |