| Abbreviation | Definition |
|---|---|
| RLM | Ridiculously Large Missile |
| RLO | Reduced Light Output |
| RLOS | Radio Line Of Site |
| RLP | Remote Line Printer |
| RLP | Reverse Life Program |
| RLPG | Regenerative Liquid Propellant Gun |
| RLSM | Released Message |
| RLST | Remote Landing Site Tower |
| RLT | Real Life Test |
| RLV | Relieve |
| RLY | Relay |
| RM | Rack Mount |
| RM | Radioman |
| RM | Range Master |
| RM | Real Marines |
| RM | Recovery Mechanism |
| RM | Reference Model |
| RM | Refrigerator Mobile |
| RM | Requirements Management |
| RM | Resource Management |