A U.S. Marine assigned to 2d Low Altitude Air Defense, Marine Corps Air Station Cherry Point, N.C., swings toward the final obstacle while completing the Tarzan Coruse at Officer Candidates 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)