JC
- JCATS – (a) Joint Conflict And Tactical Simulation ("djay-catts")
- JCDB – (i) Joint Common Data Base
- JCDS – (i) Joint Chiefs of the Defence Staff
- JCIDS – (i) Joint Capabilities Integration and Development System
- JCIET – (i) Joint Combat Identification Evaluation Team
- JCL – (i) Job Control Language
- JCMOTF – (a) Joint Civil-Military Operations Task Force
- JCP – (a) Java Community Process
- JCPM – (i) Java Child Process Manager – Jesus Christ Prison Ministry
- JCS – (i) Joint Chiefs of Staff
- JCW – (i) Juggalo Championship Wrestling
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