| Abbreviation | Definition |
|---|---|
| MOMM3 | tor Machinist's Mate 3rd Class Petty Officer |
| MOMMSR | Motor Machinist's Mate (ship Repair) |
| MOMMSR | tor Machinist's Mate (ship Repair) |
| MOMMSRD | Motor Machinist's Mate (ship Repair-diesel) |
| MOMMSRD | tor Machinist's Mate (ship Repair-diesel) |
| MOMMSRG | Motor Machinist's Mate (ship Repair-gasoline) |
| MOMMSRG | tor Machinist's Mate (ship Repair-gasoline) |
| MONCHICHIMONCHICHI | happy happy monchichi - A.A. |
| MR1 | chinery Repairman Petty Officer 1st Class |
| MR1 | Machinery Repairman Petty Officer 1st Class |
| MR2 | chinery Repairman Petty Officer 2nd Class |
| MR2 | Machinery Repairman Petty Officer 2nd Class |
| MR3 | chinery Repairman Petty Officer 3rd Class |
| MR3 | Machinery Repairman Petty Officer 3rd Class |
| MRC | chinery Repairman Chief Petty Officer |
| MRC | Machinery Repairman Chief Petty Officer |
| MRCC | Movement Report Control Center |
| MRCM | chinery Repairman Master Chief Petty Officer |
| MRCM | Machinery Repairman Master Chief Petty Officer |
| MRCS | chinery Repairman Senior Chief Petty Officer |