Marines with III Marine Expeditionary Force participated in a culminating event as part of a Marine Corps Martial Arts Program Instructor course July 28, 2016 at Camp Hansen in Okinawa, Japan. The Marines went through a three-week course which challenged them mentally and physically, pushing them past their limits. (U.S. Marine Corps photo by Cpl. Samantha Villarreal/Released) - Marines with III Marine Expeditionary Force participated in a culminating event as part of a Marine Corps Martial Arts Program Instructor course July 28, 2016 at Camp Hansen in Okinawa, Japan. The Marines went through a three-week course which challenged them mentally and physically, pushing them past their limits. (U.S. Marine Corps photo by Cpl. Samantha Villarreal/Released)

U.S. Marines with the Maritime Raid Force, 31st Marine Expeditionary Unit clear a water treatment facility at Koror, Palau on July 21, 2016. The Marines are conducting training in Palau to ensure familiarity with Palau's complex urban environment. The training events were planned out with local authorities to provide an opportunity for realistic training with minimal inconvenience to the community and environment. (U.S. Marine Corps photo by Lance Cpl. Jorge A. Rosales/ Released) - U.S. Marines with the Maritime Raid Force, 31st Marine Expeditionary Unit clear a water treatment facility at Koror, Palau on July 21, 2016. The Marines are conducting training in Palau to ensure familiarity with Palau's complex urban environment. The training events were planned out with local authorities to provide an opportunity for realistic training with minimal inconvenience to the community and environment. (U.S. Marine Corps photo by Lance Cpl. Jorge A. Rosales/ Released)