| Abbreviation | Definition |
|---|---|
| RISTA | Reconnaissance, Intelligence, Surveillance, and Target Acquisition |
| RIT | Receiver Interference Transmuter |
| RIT | Remote Imagery Transceiver |
| RIT | Repeal Implementation Team |
| RITA | Resistance Inside the Army |
| RITA | Retention Incentive Training Account |
| RITF | Range Improvement Task Force |
| RIU | Radio Interface Unit |
| RIVRON | Riverine Squadron |
| RIW | Reliability Improvement Warranty |
| RIWP | Reconfigurable Integrated-Weapons Platform |
| RJ | Re Jected |
| RJ | Rivet Joint |
| RJAF | Royal Jordanian Air Force |
| RJTD | Reconstitution Joint Table of Distribution |
| RK | Rookie |
| RKA | Roesskije Kosmitsjekoje Agentsvo |
| RKH | Riyadh Armed Forces Hospital |
| RKKMF | Raboche-Krestyanskoy Krasnoy Armii Morskoy Flot(Workers' & Peasants' Red Army Navy) |
| RKKVF | Raboche-Krestyanskoy Krasnoy Armii Vozdushniy Flot(Workers' And Peasants' Red Army Air Fleet) |