A Marine Corps Instructor of Water Survival briefs Marines with Weapons Company, 1st Battalion, 24th Marine Regiment, on their next event during water survival qualification as part of their annual training during exercise Heavy Metal 2014 at Marine Corps Base Camp Lejeune, North Carolina Aug. 11, 2014. This portion of the course requires Marines enter the water wearing a vest, helmet and rifle and then submerge themselves and remove all the equipment in a set time limit. (U.S. Marine Corps photo by Cpl. J. Gage Karwick)