B-1B Lancers from Ellsworth Air Force Base, S.D., sit on the flightline at Eielson AFB, Alaska, April 9 during Red Flag-Alaska 07-1. Red Flag-Alaska enables aircrews 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/Staff Sgt. Joshua Strang)
