United States Amy Rank Abbreviations and Acronyms

1. MMR1
   MACHINIST'S MATE (REFRIGERATION MECHANIC) 1ST CLASS PETTY OFFICER
2. MMR2
   MACHINIST'S MATE (REFRIGERATION MECHANIC) 2ND CLASS PETTY OFFICER
3. MMRC
   MACHINIST'S MATE (REFRIGERATION MECHANIC) CHIEF PETTY OFFICER
4. MMS2
   MACHINIST'S MATE (SHOP MACHINIST) 2ND CLASS PETTY OFFICER
5. MMSRE
   MACHINIST'S MATE (SHIP REPAIR-ENGINE)
6. MMSRI
   MACHINIST'S MATE (SHIP REPAIR-INSTRUMENT)
7. MN3
   MINEMAN 3RD CLASS PETTY OFFICER
8. MNC
   MINEMAN CHIEF PETTY OFFICER
9. MNCM
   MINEMAN MASTER CHIEF PETTY OFFICER
10. MNCS
    MINEMAN SENIOR CHIEF PETTY OFFICER
11. MNSA
    MINEMAN SEAMAN APPRENTICE
12. MNSR
    MINEMAN SEAMAN RECRUIT
13. MR2
    MACHINERY REPAIRMAN PETTY OFFICER 2ND CLASS
14. MR3
    MACHINERY REPAIRMAN PETTY OFFICER 3RD CLASS
15. MRC
    MACHINERY REPAIRMAN CHIEF PETTY OFFICER
16. MRCM
    MACHINERY REPAIRMAN MASTER CHIEF PETTY OFFICER
17. MRCS
    MACHINERY REPAIRMAN SENIOR CHIEF PETTY OFFICER
18. MRFA
    MACHINERY REPAIRMAN FIREMAN APPRENTICE
19. MRFN
    MACHINERY REPAIRMAN FIREMAN
20. MRFR
    MACHINERY REPAIRMAN FIREMAN RECRUIT

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