From left, U.S. Air Force Senior Airmen Kimara Duncan and Jonathan Millan, 94th Aircraft Maintenance Unit tactile aircraft maintainers, refer to their computer during routine maintenance on an F-22 Raptor at Langley Air Force Base, Va., Sept. 25, 2012. Crew chiefs perform preventative maintenance, pre- and post-flight inspections, and maintain and repair the aircraft inside and out. (U.S. Air Force photo by Senior Airman Racheal Watson/Released)