Empty mm casings pile together after 11th Security Forces members heavy weapons qualifications on Marine Corp Base Quantico, Va., Jan. 26, 2017. Qualifications lasted approximately eight hours and each person shot 1,600 rounds. ( Air Force photo by Senior Airman Philip Bryant)

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Photo credit: © AB Forces News Collection / Alamy / Afripics
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Keywords: andrews, arms, base, catm, combat, corps, guns, jjoint, m240b, machine, marine, quantico