Participants of the second-annual Cascade Challenge receive a safety briefing before the the live-fire stress shoot, held at Schofield Barracks, Hawaii, Sept. 9, 2015. The Cascade Challenge lasted three days and pitted nine two-man teams in a competition to test their combat skills, knowledge, and abilities specific to the Tactical Air Control Party mission. (U.S. Air Force photo by Senior Airman Christopher Stoltz/Released)
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