| Abbreviation | Definition |
|---|---|
| JANAP | Joint Army-Navy-Air Force Publication |
| JANOP | Joint Automatic Network Operating Procedure |
| JANUS | Joint Analog Numerical Understanding System |
| JAO | Joint Air Operations |
| JAO | Joint Area of Operations |
| JAOC | Joint Air Operations Center |
| JAOP | Joint Air Operations Plan |
| JAPO | Joint Area Petroleum Office |
| JAR | Joint Activity Report |
| JAR | Joint Aviation Requirements |
| JARB | Joint Acquisition Review Board |
| JARCC | Joint Air Reconnaissance Control Center |
| JARN | Joint Air Request Net |
| JARS | Joint Automated Readiness System |
| JAS | Jagt Attack Spaning |
| JAS | Joint Armed Services |
| JASC | Joint Action Steering Committee |
| JASCO | Joint Assault Signal COmpany |
| JASDF | Japan Air Self Defence Force |
| JASDF | Japan Air Self Defense Forces |