A U.S. Marine with the 3rd Battalion, 8th Marine Regiment holds onto the side of the pool before having to shed and retrieve his gear as part of the intermediate course of USMC Water Survival Training, June 10, 2015, at Camp Lejeune, North Carolina. Marines were given 20 seconds to completely submerse themselves and shed their gear, and then retrieve it from water 11 feet deep. (U.S. Air Force photo/Senior Airman Brittain Crolley)