Simulation combat equipment awaits U.S. Marine recruits conducting swim training aboard Marine Corps Recruit Depot Parris Island, S.C., Feb., 4, 2013. M16/A4 service rifles, Kevlar helmets, and flak jackets are used during recruit training swim qualification to simulate unforeseen situations in an amphibious assault. (U.S. Marine Corps Photo by Cpl. Aneshea S. Yee/Released)