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B-2 Spirit (meaning ghost) is the name of a multi-purpose stealth bomber developed by Northrop Grumman with the help of Boeing, capable of launching nuclear and conventional weapons. This aircraft is capable of carrying 80 230 kg JDAM smart bombs with GPS system or 16 1100 kg D83 class nuclear bombs. B-2 can travel more than 11,000 kilometers with initial refueling, and if it is refueled in the air, it can go to any place on earth. This bomber can drop many bombs at an altitude of 50,000 feet or 15.24 kilometers from the ground, away from the eyes of enemy radars. The high costs of this aircraft caused the B-2 project to be very controversial in the US Congress and the Joint Staff of the Ministry of Defense. Initially, Northrop was ordered to produce 132 of these bombers, but the end of the Cold War and the collapse of the Soviet Union greatly reduced the need for this aircraft, which was designed to penetrate the Soviet airspace and bomb its sensitive centers, and finally Only 21 of these bombers were produced. An accident in 2008 led to the destruction of one of them, and currently, 20 other aircraft are in the service of the US Air Force. The American army first used this bomber in 1999 in the Kosovo war, and then used them in the Afghanistan war, the Iraq war, and the 2011 war in Libya. The Northrop Grumman B-21 Raider is an American strategic bomber under development by Northrop Grumman for the United States Air Force. As part of the Long Range Strike Bomber (LSR-B) program, the aircraft is intended to be a strategic long-range intercontinental stealth bomber for use by the United States Air Force, capable of carrying thermonuclear and conventional weapons. By 2022, the B-21 is scheduled to enter service by 2026 or 2027. It is intended to complement the US Air Force's Rockwell B-1 Lancer, Northrop Grumman B-2 Spirit, and Boeing B-52 Stratofortress. and eventually replace them.