U.S. Marines with the 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 involved mental and physical challenges that each student had to pass in order to become an instructor in the Marine Corps Martial Arts Program. (DoD photo by Sgt. Michael V. Walters, 1st Marine Division Combat Camera, U.S. Marine Corps) Original public domain image from Flickr