| Abbreviation | Definition |
|---|---|
| I | Individual |
| I | Intelligence |
| I | Intelligence Fusion (Integrator) |
| I | Iraq |
| I&A | Identification & Authentication |
| I&A | Office of Intelligence and Analysis |
| I&C | Issues and Criteria |
| I&E | Integration and Evaluation |
| I&RTS | Integration & Run Time Specification |
| I&W | Indications and Warning |
| I&W | Indications and Warnings |
| I/B | Inboard |
| I/C | In Charge |
| I/C | Intercept |
| I/F | Interface |
| I/O | Input/ Output |
| I/R | BN Internment/resettlement Battalion |
| I/R | Internment/resettlement |
| I2 | Image Intensification |
| I2R | Imaging Infrared |