Airmen from the 99th Security Forces Squadron complete the last yards of a half-mile ruck march during the 99th SFS Warrior Challenge event Dec. 6, 2013, at Nellis Air Force Base, Nev. Each team was scored by the completion time of their half-mile ruck march. Each team is assigned an escort to follow along monitoring the teams in case any medical issues arise. (U.S. Air Force photo by Airman 1st Class Timothy Young)
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