The Rockwell B-1B Lancer is an American multi-role, long-range bomber, designed as a replacement for the B-52 and capable of flying inter-Continental missions without refuelling, then penetrating present and predicted sophisticated enemy defences. It can perform a variety of missions, including that of a conventional weapons carrier for theatre operations. It has a speed over 900 mph and a ceiling of 9000 meters. It carries a crew of four (aircraft commander, pilot, offensive systems officer and defensive systems officer). The B-1B carries armament of up to 84 Mark 82 conventional 500-pound bombs and 30 CBU-87/89/97. It can also be reconfigured to carry a wide range of nuclear weapons. Research B-1B