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The U.S. military unveiled the U.S. Air Force B-21 Raider on Friday in Palmdale, California. 

The B-21 Raider is the first new American bomber aircraft in more than three decades, and almost every aspect of the program is classified, with images showing that it resembles the B-2 Spirit. 

Manufacturer Northrop Grumman said that the rollout of the newest nuclear stealth bomber marks the first time the world’s first sixth-generation aircraft would be seen by the public. 

"When delivered to the Air Force, the B-21 will join the nation’s strategic triad as a visible and flexible deterrent; supporting national security objectives and assuring the nation’s allies and partners," the company said in a release. 

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The B-21 Raider

The B-21 Raider was unveiled on Friday in California. ((U.S. Air Force photo))

The nuclear triad includes silo-launched nuclear ballistic missiles and submarine-launched warheads.

Northrop Grumman CEO Kathy Warden told The Associated Press that the way the B-21 operates is extremely advanced. 

Air Force

Unveiled today, the B-21 Raider will be a dual-capable, penetrating-strike stealth bomber capable of delivering both conventional and nuclear munitions. The B-21 will form the backbone of the future Air Force bomber force consisting of B-21s and B-52s. ((U.S. Air Force photo))

The company said it is optimized for the high-end threat environment, using agile software development, advanced manufacturing techniques, digital engineering tools and cloud technology. 

Northrop Grumman said it is continuously working to ensure that the B-21 "will defeat the anti-access, area-denial systems it will face."

The Long Range Strike Bombe

This undated artist rendering provided by the U.S. Air Force shows a graphic of the Long Range Strike Bomber, designated the B-21. (U.S. Air Force via AP)

Warden could not discuss the specifics of those technologies but said that the bomber was more stealthy and slightly smaller than the B-2.

"When we talk about low observability, it is incredibly low-observability," she said. "You’ll hear it, but you really won’t see it."

B-21 Raider

The B-21 Raider will not make its first flight until next year. Northrop Grumman has been testing its performance using a virtual replica.  (Northrop Grumman)

Other changes likely include advanced materials used in coatings to make the bomber harder to detect, new ways to control electronic emissions and the use of new propulsion technologies, according to several defense analysts.

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While six of the B-21 Raiders are currently in production, the Air Force plans to build 100 that can be used with or without a human crew. 

The cost of the bombers remains unknown — although it was projected to be approximately $550 million each in 2010 dollars, or about $750 million in today's inflation-adjusted dollars — and the Raider will not make its first flight until next year.

Defense Secretary Lloyd Austin

U.S. Secretary of Defense Lloyd Austin speaks during a press briefing after a virtual Ukraine Defense Contact Group meeting at the Pentagon in Arlington, Virginia, on Nov. 16, 2022. (Alex Wong/Getty Images)

The company has been testing its performance using a virtual replica.

Since the contract was awarded in 2015, Northrop Grumman has assembled a team of more than 8,000 from the company, industry partners and the Air Force, consisting of more than 400 suppliers across 40 states.

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Defense Secretary Lloyd Austin and other invited guests witnessed the bomber’s public unveiling.

"We needed a new bomber for the 21st century that would allow us to take on much more complicated threats, like the threats that we fear we would one day face from China, Russia," Deborah Lee James, the Air Force secretary, said in 2015. "The B-21 is more survivable and can take on these much more difficult threats."

"The B-21 Raider is the first strategic bomber in more than three decades," Austin said during the ceremony. "It is a testament to America’s enduring advantages in ingenuity and innovation. And, it’s proof of the Department’s long-term commitment to building advanced capabilities that will fortify America’s ability to deter aggression, today and into the future."

Reuters and The Associated Press contributed to this report.