U.S. Marine Corps Sgt. Dustin O'hair, Engineer Service Company, Combat Logistics Battalion, 4th Marine Logistics Group instructor of water survival, checks his stop-watch as U.S. Marine Corps Sgt. Alonso Guajardo, Detachment 1, Communication Company, Combat Logistics Regiment 45, 4th Marine Logistics Group wireman, treads water with assistance of his inflated blouse during the Marine Corps water survival training program basic level qualification at Great Lakes Naval Station, Ill., March 21, 2015. Blouse inflation is a flotation technique taught during the course to help Marines float in the event of a water-borne mishap. (U.S. Air Force photo/Tech. Sgt. Benjamin Mota)
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