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Expended 5.56mm casings are seen in the snow as Airmen assigned to the 673d Security Forces Squadron conduct an M249 Squad Automatic Weapon, and M2 .50 Caliber machine gun qualification range on Joint Base Elmendorf-Richardson, Alaska, Jan. 10, 2018. Security Forces Airmen perform extensive training in law enforcement as well as combat tactics to protect U.S. Military bases and assets both stateside and overseas. (U.S. Air Force photo/Justin Connaher). Original public domain image from Flickr
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