| Abbreviation | Definition |
|---|---|
| ARCENT | United States ARmy CENTral Command |
| ARCI | Acoustic Rapid COTS Insertion |
| ARCOM | Army Reserve Command |
| ARCOTR | Army Reserve Components Overseas Training Ribbon |
| ARCPS | Army Requirements Capabilities Study |
| ARCS | Admiralty Raster Chart Service |
| ARCSA | Aviation Requirements for Combat Structure of the Army |
| ARCT | Air Refueling Control Team |
| ARCT | Air Refueling Control Time |
| ARCYBER | United States Army Cyber Command |
| ARD | Alberta Reinforcement Depot |
| ARDEC | Armament Research and Development Engineering Center |
| ARDF | Airborne Radio Direction Finding |
| ARDF | Automatic Radio Direction Finding |
| ARDIS | Army Research and Development Information System |
| ARDS | Automated Resources Directory Service |
| AREC | Air Resource Element Coordinator |
| AREN | Army Radio Engineered Network |
| ARES | Amateur Radio Emergency Service |
| AREST | anticipate, redifferentiate, empower, supervise and assess |