Staff Sgt. Keun Chung, a sergeant instructor at the

Staff Sgt. Keun Chung, a sergeant instructor at the Marine Corps’ Officer Candidates School, instructs officer candidates from Washington, Idaho and Montana to remain one arm’s distance away from him during an OCS preparation event at the Yakima Training Center in Yakima, Wash., April 8, 2016. During the three-day event, Marine Corps sergeant instructors and officer recruiters worked together to physically and mentally prepare candidates for the rigors of OCS, which the candidates are projected to attend aboard Marine Corps Base Quantico, Virginia. Chung is from Hoffman Estates, Ill. (U.S. Marine Corps photo by Sgt. Reece Lodder)