A Marine with the 26th Marine Expeditionary Unit practices using a respirator during underwater egress training at the Water Survival Training Center aboard Marine Corps Base Camp Lejeune, N. C., March 24, 2015. Marines and Sailors with the 26th MEU are required to complete the training in order to ensure safety and maintain readiness for future deployments. (U.S Marine Corps photo by Pfc. Dalton A. Precht/Released)