Air Force Senior Airman Kyle Knox crawls through a tunnel carrying a wooden board May 21, 2018, at the Leadership Reaction Course at Ft. Custer, Michigan. Working together in small groups, the Airmen rotated through multiple stations, transporting a 50-gallon drum or 40-pound ammo box, using only ropes or boards, across various obstacles.

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Photo credit: © RP Images / Alamy / Afripics
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