U.S. Soldiers with the 511th Engineer Company, 326th Engineer Battalion, 36th Engineer Brigade escape from a simulated CH-47 Chinook helicopter at the Allison Aquatics Training Facility during Ground Forces Water Survival Egress training at Fort Campbell, Ky., July 24, 2013. (U.S. Army photo by Staff Sgt. Thaddius S. Dawkins II/Released)