A U.S. Marine assigned to 2d Low Altitude Air Defense, Marine Corps Air Station Cherry Point, N.C., climbs on to the rope bridge while completing the Tarzan Coruse at Officer Candidate School, Quantico, Va., Dec. 16, 2014. This course is composed of obstacles designed to test coordination, balance, and physical fitness. (U.S. Marine Corps photo by Lance Cpl. Timothy A. Turner/Released)