ELLSWORTH AIR FORCE BASE, S.D. -- Members of the 28th Maintenance Squadron perform an isochronal inspection and maintenance on a B-1B Lancer at Ellsworth Air Force Base, S.D., Sept. 17, 2009. During this inspection Airmen look for and repair cracks, chafed wires, worn seals, leaks and other damage to the aircraft. (U.S. Air Force photo/Airman 1st Class Joshua J. Seybert)