Senior Airman Steven Durr, 28th Maintenance Squadron aerospace propulsion journeyman, inspects the interior of a General Electric F101-GE-102 turbofan engine with a boroscope camera at the propulsion flight building on Ellsworth Air Force Base, S.D., Nov. 29, 2011. The boroscope allows Airmen like Durr to perform preventative maintenance inspections. (U.S. Air Force photo by Airman 1st Class Zachary Hada/Released)