Participants in a ruck march challenge lift a log at Laughlin Air Force Base, Texas, Oct. 14, 2017. The ruck, which challenged the 23-person team at various points during the 10 kilometer march, consisted of many team cohesion challenges. (U.S. Air Force photo\Airman 1st Class Daniel Hambor)

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Photo by: Airman 1st Class Daniel Hambor |  VIRIN: 171014-F-IF668-0943.JPG