U.S. military members begin their first day of arctic survival training, also known as Cool School, after the morning briefing Feb. 20, 2013, Eielson Air Force Base, Alaska. The training, conducted by Det. 1, 66th Training Squadron members, exposes students to the harsh extremes of Alaskan winters in a controlled learning evironment. (U.S. Air Force Photo/Airman 1st Class Peter Reft)
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