ELLSWORTH AIR FORCE BASE S.D. – Airman 1st Class Joseph Dowdell, 28th Aircraft Maintenance Squadron crew chief, uses a ground support radio during a preflight check on a B-1B Lancer, Aug. 3. Airman Dowdell uses the ground support radio to communicate with other crew chiefs working on the B-1 during the check. (U.S. Air Force photo/Airman 1st Class Corey Hook)