Marines with Marine Medium Tiltrotor Squadron 264 wait to escape the cage during water survival training at Camp Lejeune, Apr. 28, 2016. The Marines used a simulated helicopter body while training for different underwater escape scenarios as qualification to be attached to a Marine Expeditionary Unit. (U.S. Marine Corps photo by Lance Cpl. Aaron K. Fiala/Released) - Marines with Marine Medium Tiltrotor Squadron 264 wait to escape the cage during water survival training at Camp Lejeune, Apr. 28, 2016. The Marines used a simulated helicopter body while training for different underwater escape scenarios as qualification to be attached to a Marine Expeditionary Unit. (U.S. Marine Corps photo by Lance Cpl. Aaron K. Fiala/Released)