U.S. Marines with 3rd Battalion 7th Marine Regiment conduct a buddy warm up, exercise and flexibility drill as part of a Martial Arts Instructor Trainer Course held aboard Marine Corps Air Ground Combat Center Twentynine Palms, Calif., June 5, 2013. The three week course involves mental and physical challenges that each student must pass in order to become an instructor in the Marine Corps Martial Arts Program. (U.S. Marine Corps photo by Sgt. Michael V. Walters, 1st Marine Division Combat Camera/ Released)