ELLSWORTH AIR FORCE BASE, S.D. -- Lt. Col. Jason Combs, 28th Bomb Wing director of staff, works his way through preflight checklists from the cockpit of a B-1B Lancer, Oct. 15. The pilot performs preflight checks to ensure all systems are functioning before every mission. (U.S. Air Force photo/Airman 1st Class Corey Hook)
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