ELLSWORTH AIR FORCE BASE, S.D. -- (Left to right) Airmen 1st Class Stacie Powers, Jason Pettine, Jon Bettenhausen, Justin Hildreth and Khayan Martinez, 28th Maintenance Squadron aerospace propulsion apprentices, remove bolts as a team from a fan duct on a B-1B Lancer engine here, Aug. 13. The Airmen remove the fan duct to access blades in need of repair. (U.S. Air Force photo/Airman 1st Class Anthony Sanchelli)