ELLSWORTH AIR FORCE BASE, S.D. -- Senior Airman Sean Hoke, 28th Aircraft Maintenance Squadron crew chief, looks over a B-1B Lancer checklist, June 30. Crew chiefs of the 28th AMXS maintain B-1B Lancers, the backbone of America’s long range bomber force. (U.S. Air Force Photo/Airman 1st Class Corey Hook)