U.S. Navy Lt. j.g. Collin T. Sturdivant pulls a teammate up to reach the top of a wall obstacle during a six-hour endurance course at the Marine Corps Jungle Warfare Training Center in Okinawa, Japan, Jan. 12, 2016. Sturdivant is assigned to Naval Mobile Construction Battalion 3. U.S. Navy photo by Petty Officer 1st Class Michael Gomez