| Abbreviation | Definition |
|---|---|
| RIMO | Rhode Island Military Organization |
| RIMPAC | Pacific Rim Military Exercises |
| RIMS | R&D Information Management System |
| RIMS | Registrant Information Management System |
| RIMS | Royal Indian Marine Sevice |
| RIN | Radiation Information Network |
| RINF | Resistance Is Not Futile |
| RIO | Radar Intercept Officer |
| RIP | Register of Intelligence Publications |
| RIP | Repair In Place |
| RIP | Repair, Inspect, and Paint |
| RIPL | Recon and Interdiction Planning Line |
| RIPL | Reconnaissance and Interdiction Planning Line |
| RIR | Reduction In Recruitment |
| RIRA | Real Irish Republican Army |
| RIS | Reconnaissance Information System |
| RISE | Reliability Improvement of Selected Equipment |
| RISE | Reliability Improvement Selected Equipment |
| RISF | Reliability Indexed Sensor Fusion |
| RISOP | Red Integrated Strategic Offensive Plan |