| Abbreviation | Definition |
|---|---|
| RANN | Research Applied to National Needs |
| RAP | Requirements Analysis Package |
| RAPCON | Radar Approach and Control |
| RAPS | Ram Air Progression System |
| RAPS | Right AFT Propulsion System |
| RARR | Range and Range Rate |
| RAS | Requirements Allocation Sheet |
| RASCAL | Responsive Access Small Cargo Affordable Launch |
| RASM | Remote Access Scheduling Terminal |
| RAT | Ram Air Turbine |
| RAT | Rapid Air Tranfer |
| RAT | Reserve Access Team |
| RATCC | Radar Air Traffic Control Center |
| RATT | Rockets All The Time |
| RAU | Remote Acquisition Unit |
| RAUIS | Remote Acquisition Unit Interconnecting Station |
| RAX | Remote Access Computing System |
| RAX | Remote Access Terminal |
| RB | Radar Beacon |
| RBA | Radar Beacon Antenna |