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The US Air Force unveiled its new stealth bomber, the B-21 Raider, in December. The B-21 is expected to arrive 40 years after the US's first stealth aircraft, the F-117 Nighthawk. The F-117 was officially retired in 2008, but the Air Force is still putting the stealth jet to use.The fuss about the unveiling of the new B-21 stealth bomber has drawn the aviation...