Staff Sgt. Chris McKnight and members of the 517th Aircraft Maintenance Unit, load a water crate on to a C-17 Globemaster III, at Elmendorf Air Force Base, Alaska, March 19, 2010. Sergeant McKnight and his crew from the 517th Airlift Squadron were participating in a combat simulation improved container delivery drop over Tin City, Alaska. (U. S. Air Force photo/Senior Airman Matt Coleman-Foster)