| Abbreviation | Definition |
|---|---|
| J-8 | Force Structure, Resource, and Assessment Directorate of A Joint Staff |
| J-9 | Civil-Military Operations Directorate of A Joint Staff |
| J-9 | Civil-Military Operations Staff Section |
| JA | Joint Affairs |
| JA | Judge Advocate |
| J-A | Judge Advocate Directorate of A Joint Staff |
| JA&LI | Joint Admin & Logistics Institute |
| JA/ATT | Joint Airborne and Air Transportability Training |
| JAAOC | Joint Army Air Operations Centres |
| JAAR | Joint After-Action Report |
| JAARS | Joint After Action Reporting System |
| JAARS | Joint After-Action Reporting System |
| JAAT | Joint Air Attack Team |
| JAC | Japanese Army Cypher |
| JAC | Jewish Anti-fascist Committee |
| JAC | Joint Analysis Center |
| JAC | Just A Civilian |
| JACC | Joint Airspace Control Center |
| JACC/CP | Joint Airborne Communications Center/command Post |
| JACCC | Joint Airlift Coordination and Control Cell |