U.S. Staff Sgt. Mathis Williams, a 354th Security Forces military working dog (MWD) handler, conducts a foot patrol with MWD Oopal at Eielson Air Force Base, Alaska, March 7, 2016. Williams and his fellow MWD handlers work in below zero temperatures and face long hours of darkness while stationed in the arctic. (U.S. Air Force photo by Staff Sgt. Shawn Nickel/Released)
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