OVER KANSAS -- The B-2 Spirit bomber is a revolutionary blending of low-observable technologies with high aerodynamic efficiency and large payload gives the B-2 important advantages over existing bombers. Its unrefueled range is approximately 6,000 nautical miles. Many aspects of the low-observability process remain classified; however, the B-2's composite materials, special coatings and flying-wing design all contribute to its "stealthiness." (U.S. Air Force photo by Staff Sgt. Mark Olsen)