| Abbreviation | Definition |
|---|---|
| MMSRS | chinist's Mate (ship Repair-inside) |
| MMSRS | Machinist's Mate (ship Repair-inside) |
| MMW1 | chinist's Mate (watchmaker) |
| MMW1 | Machinist's Mate (watchmaker) |
| MMW2 | chinist's Mate (watchmaker) |
| MMW2 | Machinist's Mate (watchmaker) |
| MN | Merchant Navy |
| MN1 | Mineman 1st Class Petty Officer |
| MN1 | neman 1st Class Petty Officer |
| MN2 | Mineman 2nd Class Petty Officer |
| MN2 | neman 2nd Class Petty Officer |
| MN3 | Mineman 3rd Class Petty Officer |
| MN3 | neman 3rd Class Petty Officer |
| MNA | Merchant Navy Association |
| MNC | Mineman Chief Petty Officer |
| MNC | neman Chief Petty Officer |
| MNCM | Mineman Master Chief Petty Officer |
| MNCM | neman Master Chief Petty Officer |
| MNCS | Mineman Senior Chief Petty Officer |
| MNCS | neman Senior Chief Petty Officer |