U.S. Marine Corps Staff Sgt. Matthew Hyland, a Marine Corps martial arts instructor trainer, demonstrates a technique to U.S. Marine Corps Sgt. Michael Zaharias, a martial arts instructor trainee from Detachment 1, Communication Company, Combat Logistics Regiment 45, 4th Marine Logistics Group, during a class held at Grissom Air Reserve Base, Ind., June 20, 2014. Grissom Marines went through 13 vigorous days of training to become martial arts instructors so they can help fellow Marines improve their combat skills. (U.S. Air Force photo/Tech. Sgt. Douglas Hays)
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