Marine Corps Cpl. Kelby Korby, Assault Amphibious Vehicle crew chief and instructor, Assault Amphibious Crewman Course, Assault Amphibious School Battalion, loads training ammunition into a MK-19 grenade launcher during a live-fire qualification at Marine Corps Base Camp Pendleton, California, June 28, 2018. Korby and other instructors provided guidance to the students who conducted their pre-qualification and final qualification of the Assault Amphibious Vehicle-P7/A1 weapon systems. ( Marine Corps photo by Lance Cpl. Drake Nickels)

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Photo credit: © AB Forces News Collection / Alamy / Afripics
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Keywords: 50, aav, amphibious, assault, battalion, caliber, crewman, fire, instructors, live, marines, mark-19, range, school, student, training