| Abbreviation | Definition |
|---|---|
| RM | Royal Marine |
| RM | Royal Marines |
| RM1 | RadioMan First Class |
| RM2 | RadioMan Second Class |
| RM3 | RadioMan Third Class |
| RMA | Range and Maneuver Area |
| RMA | Reliability, Maintainability, Availability |
| RMA | Restricted Machine Access |
| RMA | Revolution in Military Affairs |
| RMA | Royal Marine Artillery |
| RMA | Royal Military Academy |
| RMA | Royal Military Academy (Sandhurst, Surrey, UK) |
| RMAS | Royal Military Academy Sandhurst |
| RMB | Requirements Management Board |
| RMB | Risk Management Board |
| RMC | Chief RadioMan |
| RMC | Regular Military Compensation |
| RMC | Remote Multiplexer Combiner |
| RMC | Rescue Mission Commander |
| RMC | Resource Management Committee |