ELLSWORTH AIR FORCE BASE, S.D. – Airman 1st Class Jonathan Bettenhausen, 28th Maintenance Squadron aerospace propulsion technician, inspects a B-1B Lancer engine for possible broken safety wires and missing parts, March 25. The B-1 engines are inspected after every 100 hours of flying. (U.S. Air Force photo/Senior Airman Marc I. Lane)