1797 - GM Rating formally established

1864 - Gunner's Mate Chief established by General Order No. 36

1894 - Paygrades of First, Second, and Third Class Petty Officer
           established by General Order No. 409

1903 - Rating of Turret Captain established for Chief and First Class
          (Turret Gunner's Mates of lower pay grades remained general GMs)

1942 - WW2 Two new specialties added to the Gunner's Mate Rating:
           Armorer & Powderman

1948 - GM General Service Rating established for paygrades E-4 through E-7

1948 - GM Emergency Service Ratings established in paygrades E-4
           through E-7

            1. GMA (ARMORER)
            2. GMM (MOUNTS)
            3. GMT (TURRETS) Paygrades E-6 & E-7

                *NOTE* At this time the rating of Turret Captain was
                  disestablished and incorporated into the GM rating as
                 GMT (Turrets)

1958 - Paygrades of E-8 (GMCS) & E-9 (GMCM) established

1961 - Emergency Service Ratings (GMA, GMM, GMT) disestablished

1961 - E-8 & E-9 redesignated from General Service Rating to General
          Rating

1961 - Gunner's Mate Guns (GMG) and Gunner's Mate Missiles (GMM)
          Service Ratings established for pay grades E-4 through E-7

         GMG duties: Operating, repairing and maintaining all types of guns,
         rocket launchers, certain types of missile launchers, and their associated
         magazines and/or handling equipment.

        GMM duties:   Operation, maintenance, testing, and firing of missiles and their
        associated magazines and handling equipment.

1961 - Nuclear Weaponsman (NW) retitled to GMT.

1983 - NEC 0891 ASROC  specialist merged with GMT from GMM
          rating

1986 - WT (Weapons Technician) Rating established from the GMT rating
          (NEC's dealing with Nuclear Weapons)

1987 - GMT (Technician)  Rating merger with the GMM (Missiles) taking the
          Gunner's Mate rating back to GMG & GMM

1987 - At the E-7 level, GMG & GMM merged to become GMC

           GMC Duties: Responsible for all gun and missile systems and their
            associated magazines and handling equipment.

1997 - GMG and GMM ratings merged at the E-1 through E-9 level
           to become GM
 
 
 
 
 

2. GMM 3&2 VOL. 1 NAVEDTRA 10188 (1983)

3. GMG 1&C NAVEDTRA 10186-D1 (1981)

4. GMM 1&C NAVEDTRA 10200-D (1979)

5. GMG1 NAVEDTRA 10292 (1990)