U.S. Marine Corps photo by Lance Cpl. Christopher Johns/Released 121220-M-OB827-086.JPG
Jan 2, 2013
A Marine with Marine Heavy Helicopter Squadron 465 'Warhorse' combines rounds inside a CH-53E aboard Marine Corps Air Station Miramar, Calif., Dec. 20. The GAU-21 .50 caliber weapon system can fire 900 to 1,100 rounds per minute up to nearly 2,000 meters for defensive fire while carrying troops.
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