Senior Airman Ronnie Thacker, 11th Security Support Squadron Combat Arms instructor, opens up crates of M240B machine gun ammunition before heavy weapons qualifications at Marine Corps Base Quantico, Va., Jan. 26, 2017. Of the 1,600 rounds shot for qualification, 200 were required to be shot wearing a gas mask. ( Air Force photo by Airman 1st Class Philip Bryant)

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Keywords: andrews, arms, base, catm, combat, corps, guns, jjoint, m240b, machine, marine, quantico