| Abbreviation | Definition |
|---|---|
| JMTC | Joint Maritime Tactics Course |
| JMTC | Joint Military Transportation Command |
| JMTCA | Joint Munitions Transportation Coordinating Activity |
| JMTCSS | Joint Maritime Tactical Communications Switching System |
| JMTK | Joint Mapping Tool Kit |
| JMUA | Joint Meritorious Unit Award |
| JMV | Joint METOC Viewer |
| JMWG | Joint Medical Working Group |
| JN | Japanese Naval code |
| JN | Japanese Navy |
| JN-25 | Japanese Naval code 25 |
| JNA | Jugoslavian National Army |
| JNACC | Joint Nuclear Accident Coordinating Center |
| JNCC | Joint Network Operations (NETOPS) Control Center |
| JNCO | Junior Non Commissioned Officer (corporal) |
| JNI | Japanese Naval Instruction |
| JNIC | Joint National Integration Center |
| JNMS | Joint Network Management System |
| JNN | Joint Network Node |
| JNO | Joint Naval Operations |