After more than three decades in service with the United States Air Force, the Northrop-Grumman-built B-2 Spirit is set to retire, along with its older sibling, the B-1, replaced by the new B-21 Raider. Also manufactured by Northrop, the sixth-generation bomber represents an evolution in technological advancement, with an open architecture that allowed for rapid inclusion of new weaponry, and advanced digital manufacturing (AM) that is claimed to help mitigate the substantial risk of production.
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