Marine Challenge
U.S. Air Force Master Sgt. Kevin Shaver, 355th Civil Engineer Squadron, and Airman 1st Class Corinthain Maldonado, 355th Communications Squadron, run the track portion of the Marine Challenge at the Benko Fitness Center track on Davis-Monthan Air Force Base, Ariz., March 23. Participants ran half a mile in uniform during the competition. (U.S. Air Force photo by Airman 1st Class Saphfire Cook/Released)