Senior Airman Lance Doss, 11th Security Forces Squadron member, shoots a M240B machine gun while Staff Sgt. Alfred Vassallo, 11th Security Support Squadron Combat Arms instructor, oversees during 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.

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Photo credit: © Chuck Little / Alamy / Afripics
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