United States Amy Rank Abbreviations and Acronyms

1. MME3
   MACHINIST'S MATE (ENGINEMAN) 3RD CLASS PETTY OFFICER
2. MMG1
   MACHINIST'S MATE (GAS GENERATING) PETTY OFFICER 1ST CLASS
3. MMG2
   MACHINIST'S MATE (GAS GENERATING) PETTY OFFICER 2ND CLASS
4. MMG3
   MACHINIST'S MATE (GAS GENERATING) PETTY OFFICER 3RD CLASS
5. MMGE1
   MACHINIST'S MATE (AVIATION BOMBING) PETTY OFFICER FIRST CLASS
6. MMGFA
   MACHINIST'S MATE (GAS GENERATING) FIREMAN APPRENTICE
7. MMGFN
   MACHINIST'S MATE (GAS GENERATING) FIREMAN
8. MMGFR
   MACHINIST'S MATE (GAS GENERATING) FIREMAN RECRUIT
9. MML1
   MACHINIST'S MATE (GENERAL) PETTY OFFICER 1ST CLASS
10. MMLFA
    MACHINIST'S MATE (GENERAL) FIREMAN APPRENTICE
11. MMLFN
    MACHINIST'S MATE (GENERAL) FIREMAN
12. MMLFR
    MACHINIST'S MATE (GENERAL) FIREMAN RECRUIT
13. MMMB1
    MACHINIST'S MATE (MOTOR BOAT) PETTY OFFICER FIRST CLASS
14. MMMB2
    MACHINIST'S MATE (MOTOR BOAT) PETTY OFFICER SECOND CLASS
15. MMO1
    MACHINIST'S MATE (OPTICIAN) PETTY OFFICER FIRST CLASS
16. MMO2
    MACHINIST'E MATE (OPTICIAN) PETTY OFFICER SECOND CLASS
17. MMR3
    MACHINIST'S MATE (REFRIGERATION MECHANIC) 3RD CLASS PETTY OFFICER
18. MMRFA
    MACHINIST'S MATE (REFRIGERATION MECHANIC) FIREMAN APPRENTICE
19. MMRFN
    MACHINIST'S MATE (REFRIGERATION MECHANIC) FIREMAN
20. MMRFR
    MACHINIST'S MATE (REFRIGERATION MECHANIC) FIREMAN RECRUIT

Last updated: May 24, 2020 — Total entries: 3,362