A U.S. Air Force B-1B Lancer aircraft starts its engine. A U.S. Air Force B-1B Lancer aircraft starts its engine during exercise Red Flag-Alaska 07-1 at Ellsworth Air Force Base, S.D., on April 13, 2007. Red Flag-Alaska is a field training exercise for U.S. forces flown under simulated air combat conditions conducted on the Pacific Alaskan Range Complex with air operations flown out of Eielson and Elmendorf Air Force Bases. SHARE: Download: Full Size (0.03 MB) Credit: VIRIN: 171519-N-RAA35-464.jpg Photo Gallery