EIELSON AIR FORCE BASE, Alaska -- B-1B Lancers from Ellsworth Air Force Base, South Dakota, sit on the flightline here on Apr 9 during Red Flag-Alaska 07-1. Red Flag-Alaska enables aviation units to sharpen their combat skills by flying ten simulated combat sorties in a realistic threat environment. Additionally, the training allows them to exchange tactics, techniques, and procedures and improve interoperability. (U.S. Air Force Photo by Staff Sgt Joshua Strang)