| Acronyms | Meaning / Significance |
Source |
| JACC | joint area control centre | |
| JAPIC | joint allied public information centre | |
| JASMIN | Joint analysis system for military intelligence | GE intelligence information system of FAFIO |
| JASMIN | joint armed services military intelligence network | |
| JBIG | joint bi-level image experts group | |
| JC3RCC | joint C3 requirements and concepts committee | |
| JCC | joint commanders conference | |
| JCC | joint coordination centre | |
| JCEB | joint communications electronic board | |
| JCIC | joint counter intelligence cell | |
| JCOC | joint command and operations centre | |
| JDISS | joint defence int system | LOCE, US BICES |
| JEG | joint expert group | |
| JETS | jammer equipment techniques simulator | |
| JFAI | joint final acceptance inspection | |
| JFAI | joint formal acceptance inspection | |
| JIC | joint intelligence centre | |
| JIEO | joint interoperability and engineering organisation | |
| JIWC | joint indicator and warning cell | |
| JLV | joint likelihood vector | |
| JMAPS | GOTS joint message processing system | US DOD |
| JMC | joint medical committee | PB&Cs |
| JMCC | joint movement coordination cell | |
| JMDC | joint message distribution cell | |
| JMEMS | Joint Munitions Effects Manual System | |
| JMG | joint management group | |
| JOC | joint operations centre | |
| JOCS | Joint Operations Coordination System | |
| JOSA | joint staff agreement | |
| JOTS | joint operational tactical system | Ex Strong Resolve 95 / Navy |
| JPCC | joint petroleum coordination cell | |
| JPEG | joint photographic experts group | |
| JPFP | joint project evaluation panel | |
| JPI | joint public information | |
| JPL | jet propulsion laboratory | |
| JRSC | jamming resistent secure communications | |
| JSC | joint spectrum centre | |
| JSMS | joint spectrum management system | |
| JSSA | joint source selection authority | |
| JSSI | joint safety and security inspection | |
| JSTARS | joint surveillance and target attack radar system | sensor input for LOCE |
| JTC | joint technical committee | |
| JTC | joint transport company | |
| JTC3A | joint tactical command, control and comm. agency | |
| JTF | joint tactical fusion | LOCE |
| JTIDS | joint tactical information distribution system | |
| JTLS | joint theatre level simulation | |
| JTM | job transfer and manipulation | |
| JTPG | joint training planning group | |
| JWFC | CP 5A0008 | |
| JWG | joint working group | |
| JWID | Joint Warrior Interoperability Demonstration |