170307-M-ZL982-189 CAMP LEJEUNE, N.C. (March 7, 2017) Marines assigned to 2nd Reconnaissance Battalion, 2nd Marine Division, and Sailors put on dive gear during a pre-dive class at Camp Lejeune, N.C. The pre-dive class teaches combat swimming skills, breathing techniques, as well as mental and physical conditioning to prepare Marines for the Combatant Divers Course. (U.S. Marine Corps photo by Lance Cpl. Jon Sosner/Released)