Staff Sgt. Kevin Blevins, 60th Diagnostics and Therapeutics Squadron, holds his rucksack above his head while traversing the base pool during a GoRuck Light Challenge Sept. 12, 2015, at Travis Air Force Base, California. Designed and developed by former United States military special operations personnel, the challenge is meant to provide an introduction to the team-based training found within the special operations community. (U.S. Air Force photo/Senior Airman Charles Rivezzo)
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