Marine Corps Staff Sgt. Milton D. Zavala, center, a drill instructor with Instructional Training Company, Support Battalion, Recruit Training Regiment, addresses Marines at Marine Corps Recruit Depot San Diego, Calif., Oct. 26, 2016. Zavala briefed the Marines on the rules they were required to abide by as they participated in a martial arts instructor course. ( Marine Corps photo by Lance Cpl. Erick J. ClarosVillalta)

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