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Sailors an MK mm machine gun. . MEDITERRANEAN SEA Nov Gunner's Mate nd Class Juan Herrera instructs Gunner's Mate Seaman Jordan Jarvis on an MK MOD mm machine gun system aboard the amphibious dock landing ship USS Gunston Hall LSD Gunston Hall and the embarked th Marine Expeditionary Unit th MEU are part of the Iwo Jima Amphibious