Runners sprint off the starting line of the 16th Annual Security Forces Ruck March Feb. 21, 2015, at Dover Air Force Base, Del. The ruck march consisted of 54 teams with 192 runners who ran the 6.2 mile course while wearing a 30-pound ruck sack. (U.S. Air Force photo/Airman 1st Class William Johnson)
Airman 1st Class William Johnson
Taken on 21 February 2015
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