| Abbreviation | Definition |
|---|---|
| MJ | Marine Jet |
| MJ | Metal Jacket |
| MJA | Military Justice Attorneys |
| MJB | Missile Junction Box |
| MJCS | Joint Chiefs of Staff Memorandum |
| MJIA | Military Justice Improvement Act |
| MJLC | Multinational Joint Logistic Center |
| MJP | Military Judgement Panel |
| MJR | Major |
| MJT | More Job Training |
| MJWG | MANPRINT Joint Working Group |
| MK | Mark |
| MK | Mathematical Knowledge |
| MK | Military Kid |
| MKC | Military Kids Club |
| MKI | Mark I |
| MKII | Mark II |
| M-Kill | Mobility Kill |
| MKO | Mujahedin-e Khalq Organization |
| MKSF | Mortal Kombat Special Forces |