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- The Rockwell B-1 Lancer[N 1] is a supersonic variable-sweep wing, heavy bomber used by the United States Air Force. It is commonly called the “Bone” (from “B-One”). It is one of three strategic bombers in the U.S. Air Force fleet as of 2020, the other two being the B-2 Spirit and the B-52 Stratofortress. (info from Wikipedia).