rockwell b-1 lancer

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the rockwell b-1 lancer is a supersonic variable-sweep wing, heavy bomber used by the united states air force. it is commonly called the "bone" . it is one of three strategic bombers in the u.s. air force fleet as of 2021, the other two being the b-2 spirit and the b-52 stratofortress. the b-1 was first envisioned in the 1960s as a platform that would combine the mach 2 speed of the b-58 hustler with the range and payload of the b-52