U.S. Sailors HM2 Mark L. Warren, front, a corpsman aerospace physiology technician assigned to Aviation Survival Training Center, and Lt. Maile L. Richert, an aeromedical safety officer assigned to Marine Aircraft Group 26, perform drown proofing drills 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 air crew endurance survival vests. (U.S. Marine Corps photo by Cpl. Yosselyn A. Munnerlyn/Released)