U.S. Marine Corps Lance Cpl. Mathew Donat, Detachment 1, Communication Company, Combat Logistics Regiment 45, 4th Marine Logistics Group radio operator, uses his pack to help him swim during the 25-meter pack-swim portion of the Marine Corps water survival training program basic qualification at Great Lakes Naval Station, Ill., March 21, 2015. Marines are required to complete basic level of qualifications every two years and can progress to advanced levels of training on a voluntary basis. (U.S. Air Force photo/Tech. Sgt. Benjamin Mota)
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