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New stealth nuclear bomber unveiled for U.S. Air Force

STORY: Similar in shape to the B-2, a "flying wing" design already in the Air Force's inventory, the B-21 "Raider" will also be able to deliver nuclear weapons around the world because of long-range and mid-air refuelling capabilities.

U.S. Secretary of Defense Lloyd Austin called B-21 "the first strategic bomber in more than three decades," predicting that "even the most sophisticated air defense systems will struggle to detect the B-21 in the sky."

Each B-21, which can deliver both conventional and nuclear bombs, was projected to cost approximately $550 million each in 2010 dollars, or about $750 million in today's inflation-adjusted dollars.

The Air Force planned to buy at least 100 of the planes and begin to replace B-1 and B-2 bombers.