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B-1b HistoryThe first B-1B was delivered to the Air Force in June 1985 and it was operational on Oct. 1 1986. The 100th and final B-1B was delivered on May 2 1988. B-1B is a modified form of B-1A. Initially B-1A was used but then after technological advances the second version entered mass scale production. B-1B has major revisions in offensive avionics, defensive avionics, weapon payload, range, and speed. It has a new radar, new generation computers, expanded ECM capabilities, reduced RCS, and avionics compatibility with the ALCM. The wing sweep is restricted to 60 which limit the maximum speed to just above the speed of sound.
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