The Rockwell International (now Boeing) B-1B Lancer is a four-engine, supersonic, swing wing, jet powered, heavy strategic bomber. Used by the United States Air Force, it is primarily a low-level penetrator. The B-1B has long range capability and travels at high altitude with speed of Mach 1.25, and at low level speed of Mach 0.92. The B-1B celebrated its first flight on December 23, 1974 and became operational in 1986 with USAF Strategic Air Command as a nuclear bomber. In early 1990s B-1B fleet was reassigned to Air Combat Command and aircrafts were converted to use conventional and all-weather guided

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