| Abbreviation | Definition |
|---|---|
| ARMY | Ain't Ready For Marines Yet |
| ARMY | Another Requisitioned Military Youth |
| ARMY | Table of Distribution and Allowances/ Installation Army |
| ARMY | TDA/Installation Army |
| ARMY | The Operating Army ( divisions and corps) |
| ARMY | The Operating Army (divisions and corps) |
| ARNC | Alliance of Really Nice Countries |
| ARNG | Alaska Army National Guard |
| ARNG | Army National Guard |
| ARNG | Army Reserve and National Guard |
| ARNG | Army Reserve National Guard |
| ARNGUS | Army National Guard of the United States |
| ARNORTH | United States ARmy NORTH |
| ARO | Army Radio Operator |
| ARO | Army Research Office |
| AROP | Army Reserve Operational Projects |
| ARP | Acquisition Requirements Packages |
| ARP | Address Resolution Protocol |
| ARP | Air Raid Patrol |
| ARP | Air Raid Place |