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United States Marine Corps Enlisted Job Descriptions and Qualification Factors

0331, Machine Gunner

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August 22, 2013 - U.S. Marine Corps gunner provides aerial security with a GAU-21 .50 caliber machine gun inside a CH-53E Super Stallion over Helmand province, Afghanistan.
Stocktrek Images/Stocktrek Images/Getty Images

Summary. The machine gunner is responsible for the tactical employment of the 7.62mm medium machine gun, the 50 cal., and 40mm heavy machine-gun, and their support vehicle. Machine gunners provide direct fire in support of the rifle and LAR squads/platoons/companies and the infantry and LAR battalions. They are located in the weapons platoons of the rifle and LAR companies and the weapons company of the infantry battalion. Noncommissioned officers are assigned as mortar gunners, forward observers, fire direction plotters, and squad and section leaders.

Requirements/Prerequisites

(1) GT score, of 80 or higher.

(2) Complete the Machine gunner Course at the School of Infantry, MCB Camp Lejeune, NC, or MCB Camp Pendleton, CA, or upon completion of appropriate MOJT.

Duties. For a complete listing of duties and tasks, refer to MCO 1510.35, Individual Training Standards.

Related DOT Classification/DOT Code. Infantry Weapons Crewmember 378.684-026.

Related Military Skill

(1) Rifleman, 0311.

(2) Assaultman, 0351.

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