| Abbreviation | Definition |
|---|---|
| MMAH1 | Machinist's Mate (aviation-hydrogen) Petty Officer 1st Class |
| MMAH2 | chinist's Mate (aviation-hydrogen) Petty Officer 2nd Class |
| MMAH2 | Machinist's Mate (aviation-hydrogen) Petty Officer 2nd Class |
| MMAP1 | chinist's Mate (aviation-photographic) Petty Officer 1st Class |
| MMAP1 | Machinist's Mate (aviation-photographic) Petty Officer 1st Class |
| MMAP2 | chinist's Mate (aviation-photographic) Petty Officer 2nd Class |
| MMAP2 | Machinist's Mate (aviation-photographic) Petty Officer 2nd Class |
| MMC | chinist's Mate Chief Petty Officer |
| MMC | Machinist's Mate Chief Petty Officer |
| MMCB | chinist's Mate (construction Battalion) |
| MMCB | Machinist's Mate (construction Battalion) |
| MMCBE | First Class |
| MMCBE | Machinist's Mate (construction Battalion-equip Oper) Petty Officer First Class |
| MMCBE | rst Class |
| MMCM | chinist's Mate Master Chief Petty Officer |
| MMCM | Machinist's Mate Master Chief Petty Officer |
| MMCS | chinist's Mate Senior Chief Petty Officer |
| MMCS | Machinist's Mate Senior Chief Petty Officer |
| MME1 | chinist's Mate (engineman) 1st Class Petty Officer |
| MME1 | Machinist's Mate (engineman) 1st Class Petty Officer |