| Abbreviation | Definition |
|---|---|
| ACA | After Contract Award |
| ACA | Air Combat Command |
| ACA | Airborne Collection Assembly |
| ACA | Airlift Clearance Authorities |
| ACA | Airlift Clearance Authority |
| ACA | Airspace Control Authority |
| ACA | Airspace Coordination Area |
| ACA | Andres Castro Arms |
| ACA | Army Contracting Agency |
| ACA | Army Control Authority |
| ACA | Automatic Channel Assignment |
| ACA | Automatic Conference Arranger |
| ACAA | Automatic Chemical Agent Alarm |
| ACAB | Air Cavalry Attack Brigade |
| ACACS | Army Command and Area Communications System |
| ACAD | Automatic Chemical Agent Detector |
| ACAIS | Air Carrier Airport Information System |
| ACALA | Armament and Chemical Acquisition and Logistics Activity |
| ACALA | Armament and Chemical Acquisition and Logistics Agency |
| ACALS | Army Computer-Aided Logistics System |