U.S. Marines and Sailors with 2nd Reconnaissance Battalion, 2nd Marine Division (MARDIV), perform flutter kicks during a physical training exercise at the Courthouse Bay pool on Camp Lejeune, N.C., June 17, 2014. Marines and Sailors take part in the physical training to strengthen their swimming abilities before attending the naval dive school at the Naval Diving and Salvage Training Center in Panama City, Fla. (U.S. Marine Corps photo by Lance Cpl. Christopher A. Mendoza, 2nd MARDIV, Combat Camera/Released)