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A GMGC is a Gunner's Mate - there are 2 types of GM's, a GMG, and a GMM.

GMG stands for Gunner's Mate (Guns); GMM stands for Gunner's Mate (Missile). The "C" stands for Chief Petty Officer (E-7). The rate/rank therefore stands for Gunner's Mate (Guns) Chief.

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14y ago

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