ELLSWORTH AIR FORCE BASE, S.D. - Members of the 28th Maintenance Squadron use a variety of tools during their daily duties, such as an impact ratchet wrench, and adjustable wrench which are essential in various stages of maintenance on B-1B Lancer engine trailers, April 9. The 28 MXS services 29 B-1s from two bomb squadrons. (U.S. Air Force photo/Senior Airman Marc I. Lane)