| Abbreviation | Definition |
|---|---|
| SIPG | Service in Paygrade |
| SIPRNET | Secret Internet Protocol Router Network |
| SIPS | Security Intelligence Products And Systems |
| SIPS | Structural Insulated Panel System |
| SIQ | sick in quarters |
| SIR | Safe Impact Round |
| SIR | Self Insured Retention |
| SIR | Serious Incident Report |
| SIR | Specific Information Requirement |
| SIR | Strategically Integrated Reinforcements |
| SIRA | Strategic Industry Research Analysis |
| SIRADS | Stored Imagery Repository and Dissemination System |
| SIRCS | Shipboard Intermediate Range Combat System |
| SIRCUS | Standard Information Retrieval Capability for Users |
| SIRD | Site Index Report Document |
| SIRD | System Interface Requirements Document |
| SIRMO | Senior Information Resources Management Official |
| SIRR | Software Integration Readiness Review |
| SIRRA | Sleep-Induction/Rapid Re-Awakening |
| SIS | Secret Intelligence Service |