Air Force Photos

Participants climb up an obstacle during a mud run event as part of the third annual Thunderbolt Cup Sept. 27, 2018, at Luke Air Force Base, Ariz. The Thunderbolt Cup is a two-day, olympic-style event that tests Airmen's physical and mental readiness. (U.S. Air Force photo by Senior Airman Alexander Cook)

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Photo by: Airman 1st Class Alexander Cook |  VIRIN: 180927-F-BQ566-927.JPG