ELLSWORTH AIR FORCE BASE, S.D. -- B-1B Lancers undergo maintenance and checks on the flightline before take off, April 8. The B-1 is a highly versatile, multi-mission weapon system. The B-1B's synthetic aperture radar is capable of tracking, targeting and engaging moving vehicles as well as self-targeting and terrain-following modes. (U.S. Air Force photo/Airman 1st Class Anthony Sanchelli)