The Rockwell B-1 Lancer is a four-engine supersonic variable-sweep wing, jet-powered strategic bomber used by the United States Air Force (USAF). It was first .\r
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The B-1B Lancer-Supersonic Strategic Bomber-USAF-Capable of flying intercontinental missions without refueling-The B-1B Lancer is a variable swing wing .\r
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Courtesy: Defense Imagery Management Operations Center, Video by Tech. Sgt. Robert Wilson. Two B-1 bombers take off. B-1 participation in the Red Flag .