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U.S. Marine Corps Cpl. Sierra Vandermark and her military working dog, Kas, provide security during a low-light assault as part of a field training exercise, May 22, 2018, at White Beach Naval Facility, Okinawa, Japan. The exercise tested the Marines’ ability to use nonlethal force, operate entry control points and process crime scene evidence. Vandermark is a native of Palmer, Alaska.