| Abbreviation | Definition |
|---|---|
| MME2 | chinist's Mate (engineman) 2nd Class Petty Officer |
| MME2 | Machinist's Mate (engineman) 2nd Class Petty Officer |
| MME3 | chinist's Mate (engineman) 3rd Class Petty Officer |
| MME3 | Machinist's Mate (engineman) 3rd Class Petty Officer |
| MMFA | chinist's Mate Fireman Apprentice |
| MMFA | Machinist's Mate Fireman Apprentice |
| MMFN | chinist's Mate Fireman |
| MMFN | Machinist's Mate Fireman |
| MMFR | chinist's Mate Fireman Recruit |
| MMFR | Machinist's Mate Fireman Recruit |
| MMG1 | chinist's Mate (gas Generating) Petty Officer 1st Class |
| MMG1 | Machinist's Mate (gas Generating) Petty Officer 1st Class |
| MMG2 | chinist's Mate (gas Generating) Petty Officer 2nd Class |
| MMG2 | Machinist's Mate (gas Generating) Petty Officer 2nd Class |
| MMG3 | chinist's Mate (gas Generating) Petty Officer 3rd Class |
| MMG3 | Machinist's Mate (gas Generating) Petty Officer 3rd Class |
| MMGC | chinist's Mate (gas Generating) Chief Petty Officer |
| MMGC | Machinist's Mate (gas Generating) Chief Petty Officer |
| MMGE1 | chinist's Mate (aviation Bombing) Petty Officer First Class |
| MMGE1 | Machinist's Mate (aviation Bombing) Petty Officer First Class |