Staff Sgt. Tyler Berthelot, 2nd Aircraft Maintenance Squadron flight control systems journeyman, crosses an obstacle during the 2017 Defenders of Liberty Mud Run at Barksdale Air Force Base, La., April 1. The race offered competitive and noncompetitive waves throughout the day. ( Air Force photo/Senior Mozer O. Da Cunha)

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Photo credit: © AB Forces News Collection / Alamy / Afripics
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