| Abbreviation | Definition |
|---|---|
| RAS | Refueling At Sea |
| RAS | Relative Army Strength |
| RAS | Replenishment At Sea |
| RASA | Ready Ammo Storage Areas |
| RASC | Royal Army Service Corps |
| RASCA | Royal Australian Survey Corps Army |
| RASCAL | Rotocraft/ Aircrew Systems Concepts Airborne Laboratory |
| RASER | Research Radar and Seeker Evaluator |
| RASF | Revolutionary Army Of Structuralist Formalism |
| RASH | Red and Anarchist Skinheads |
| RASIN | Radio Signal Notation |
| RAS-OT | Readiness Assessment System - Output Tool |
| RASP | Range Action and Safety Plan |
| RASPUTIN | Rapid Scenario Preparation Unit for Intelligence |
| RASS | Rhine Army Summer Show |
| RAST | Recovery Assistance, Securing, and Traversing Systems |
| RASU | Random Access Storage Unit |
| RAT | Radical Adversial Terminators |
| RAT | Rapid Assault Tactics |
| RAT | Rapid Attack Tactics |