U.S. Navy HM2 Mark L. Warren, a corpsman aerospace physiology technician assigned to Aviation Survival Training Center, retrieves an air crew endurance survival vest from the bottom of the pool during a water survival training exercise at Marine Corps Air Station Cherry Point, N.C., Dec. 8, 2014. The exercise was conducted to familiarize the Sailors with the safety equipment. (U.S. Marine Corps photo by Cpl. Yosselyn A. Munnerlyn/Released)