The B-2 “Spirit” is a long-range, heavy strategic bomber developed by Northrop Grumman for the United States Air Force. First flown in 1989 and entering service in 1997, the B-2 is renowned for its distinctive flying-wing design and advanced stealth technology, enabling it to penetrate dense air defences and deliver both conventional and nuclear weapons. Conceived during the Cold War to counter evolving Soviet defences, the B-2's low observable characteristics, combined with high payload capacity and intercontinental range, give it unique strategic value. Despite its advanced design, development and production were slow and costly. Following collapse of the Soviet Union the plan for 132 aircraft was cut and subsequently only 21 B-2A aircraft were built. Only the B-2A variant was produced. There were proposals and conceptual developments for further variants, but these never entered service. The name “Spirit” was officially applied to the B-2A bomber at its rollout ceremony on 22 November 1988. At that event, the aircraft was formally revealed to the public for the first time at Northrop's facilities in Palmdale, California, and it was announced as the “B-2 Spirit”, reflecting its stealthy, almost ghost-like ability to avoid detection. Subsequently, each individual aircraft received its own unique name, typically honouring a U.S. state, such as "Spirit of America", "Spirit of Kansas", "Spirit of New York". B-2s operate in frontline service today with the 509th Bomb Wing based at Whiteman Air Force Base, Missouri. Periodic upgrades will extend its operational life into the 2030s. Two aircraft have been lost in accidents.