Tech. Sgt. Luke Kegley and Senior Airman Robert Cadreau, 28th Maintenance Squadron aerospace propulsion technicians, closely monitor a borescope view screen as they inspect the combustion section of a B-1 engine in an aircraft hangar on Ellsworth Air Force Base, S.D., July 19, 2012. The borescope consists of a small camera on the end of a tube that projects the image onto a screen and allows Airmen to inspect otherwise inaccessible parts of an aircraft's engine. (U.S. Air Force photo by Airman Ashley J. Cass/Released)