Marine Corps Sgt. Chad B. Koss, a student at Drill Instructor School, Support Battalion, Recruit Training Regiment, lays in the prone position prior to the start of a combat fitness test at Marine Corps Recruit Depot San Diego, Calif., March 11, 2016. Koss assumed the prone position to begin the maneuver under fire portion of a combat fitness test. ( Marine Corps photo by Lance Cpl. Robert G. Gavaldon/Released)

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Photo credit: © AB Forces News Collection / Alamy / Afripics
License: Licensed
Model Released: No

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