| Abbreviation | Definition |
|---|---|
| ARA | Army Of Revolutionary Assassins |
| ARA | Assigned Responsible Agency |
| ARA | Australian Regular Army |
| ARAAV | Armored Reconnaissance/ Airborne Assault Vehicle |
| ARABS | Aerial Re-supply and Accompanying Bundle System |
| ARAC | Army Reserve Aviation Command |
| ARAP | Army Readiness Assessment Program |
| ARAP | Army Remedial Action Plan |
| ARAT | Army Reprogramming Analysis Team |
| ARAV | Army Aviator |
| ARB | Acquisition Review Board |
| ARB | Administrative Review Board |
| ARB | Alternate Recovery Base |
| ARB | Assign Receive Bypass list |
| ARB | Aviation Repair Base |
| ARBC | United States Army Recruiting Battalion Columbus |
| ARBH | Army of the Republic of Bosnia and Herzegovina |
| ARBRL | Army Materiel Command, Ballistic Research Lab APG, MD |
| ARBS | Angle Rate Bombing System |
| ARC | Accounting Requirements Code |