U.S. Air Force Staff Sgt. Adam Derycke, 1st Operation Support Squadron, Survival Evasion Resistance and Escape specialist, swims to a survivor during a search and rescue exercise at Langley Air Force Base, Va., Sept. 22, 2011. The purpose of this exercise was to evaluate the base's ability to respond to an aircraft mishap. (U.S. Air Force photo by Staff Sgt. Antoinette Gibson/Released)