Marines work together to perform squad sit-ups in the waves of Kin Blue, Okinawa, Nov. 21, during the culminating event for Marine Corps Martial Arts Instructor course 1-15. During the culminating event, the Marines and sailor were split up into their respected belt levels and had to work together through mental and physical fatigue to earn their instructor tab. The course was run by Headquarters and Support Battalion, Marine Corps Installation Pacific-Marine Corps Base Camp Butler, Japan. (Marine Corps Photo by Cpl. Joey S. Holeman, Jr./ Released)