| Abbreviation | Definition |
|---|---|
| JACCE | Joint Air Component Coordination Element |
| JACG | Joint Aeronautical Commanders Group |
| JACK | Computer generated icons |
| JACO | Joint Actions Control Office |
| JACS | Joint Automated Communication-Electronics Operating Instructions System |
| JACS | JUMPS (Joint Uniform Military Pay System) Army Automated Coding System |
| JACS | JUMPS Army Automated Coding System |
| JACT | Jesus Army Charitable Trust |
| JAD | Joint Analysis Division |
| JADO | Joint Air Defense Operation |
| JADO | Joint Air Defense Operations |
| JADOCS | Joint Automated Deep Operations Coordination System |
| JAF | Jordanian Armed Forces |
| JAFO | Just Another Film Observer |
| JAFO | Just Another Freaking Observer |
| JAFPUB | Joint Armed Forces Publication |
| JAFWIN | JWICS Air Force Weather Information Network |
| JAG | Judge Advocate General |
| JAG | Judge Advocates General |
| JAGMAN | Manual of The Judge Advocate General (US Navy) |