ELLSWORTH AIR FORCE BASE, S.D.-- (Left) Capt. Derek Oakley and Maj. Chris Lovegren, 34th Bomb Squadron pilots, work their way through pre-flight checklists from the cockpit of a B-1B Lancer before takeoff Nov. 23. This flight is Captain Oakley's aircraft commander certification flight. (U.S. Air Force photo/Airman 1st Class Corey Hook)