Marines with Company A, Infantry Training Battalion, School of Infantry-West (SOI-W), prepare to fire the M2A1 .50 caliber heavy machine gun as part of their basic infantry training Sept. 20, 2016, at Marine Corps Base Camp Pendleton, Calif. The M2A1 is new to the Marine Corps and has set headspace and timing which is an upgrade from the older M1A1 which requires manual adjustments. SOI-West trains riflemen, infantrymen and assault amphibian crewman in MOS skills across the infantry training continuum. (Offical Marine Corps photo by Lance Cpl. Joseph A. Prado/released)

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Photo credit: © AB Forces News Collection / Alamy / Afripics
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Keywords: .50, battalion, cal, company, corps, fire, infantry, itb, live, m2a1, marine, school, soi, training, usmc, west