| Abbreviation | Definition |
|---|---|
| IWWS | Inland Waterway System |
| IX | Unclassified Miscellaneous ship type |
| IXMP | Information Standards Management Panel |
| IXP | Information Exchange Plan |
| IYAAYAS | If You Ain't Ammo, You Ain't Special |
| IYC | Iranian Youth Centre |
| J | Jaktplan |
| J | Join |
| J | Joining |
| J | Joint |
| J&A | Justification and Approval |
| J.D. | Other Intelligence Systems Pms (Integrator) |
| J-1 | Manpower and Personnel Directorate of A Joint Staff |
| J-1 | Manpower and Personnel Staff Section |
| J-2 | Intelligence Directorate of A Joint Staff |
| J-2 | Intelligence Staff Section |
| J-2A | Deputy Directorate For Administration of A Joint Staff |
| J2-CI | Joint Counterintelligence Office |
| J-2J | Deputy Directorate For Support of A Joint Staff |
| J-2M | Deputy Directorate For Crisis Management of A Joint Staff |