In September 2015, Northrop Grumman won the LRSB competition, and the winning NG design was designated B-21 and christened the Raider. The official name Raider is an honorary nod to the men who took part in the Doolittle Raid on Tokyo in April 1942, suggested for the B-21 at the behest of Richard E. Cole, the last living Doolittle Raider, while the allocation of B-21 to the Raider was quite surprising because people expected the designation B-3 to be assigned to whichever design won the LRSB competition. The B-21 Raider was rolled out in December 2022 and flew on November 10, 2023, with the USAF .
Given that the losing Lockheed Martin/Boeing design for the LRSB competition was derived from the team's subsonic Next-Generation Bomber design (which was a flying wing similar to the Lockheed P-175 Polecat technology demonstrator), the experience garnered by Northrop Grumman with flight tests of the stealthy unmanned strategic reconnaissance aircraft informally known as "RQ-180"
has been suggested as the reason for Northrop Grumman winning the LRSB contest, given that the "RQ-180" is derived from one of Northrop Grumman's SensorCraft concept studies with a simple flying wing planform similar to the initial B-2 design with a single sawtooth trailing edge on the wing center section and apparently has the same wing planform as the B-21.
I'm reserving judgement on how many B-21s will be manufactured, especially bearing in mind the fact that only 21 B-2s were built instead of the 132 aircraft which the US Air Force had hoped to procure. With the service entry of the B-52J (upgrade of the B-52H with Rolls-Royce F130 turbofans and upgraded avionics)
slipping to 2033, production of the B-21 offers insurance against any protracted upgrades of existing B-52H fleet to B-52Js or a handful of crashes involving the oldest operational B-52Hs.
Links:
The futuristic new B-21 bomber took off on its first flight Friday morning from Palmdale, a milestone event as the plane continues testing.
www.latimes.com
Following its formal unveiling, Dec. 2, 2022, the B-21 Raider began flight testing here where it continues to make progress toward becoming the backbone of the U.S. Air Force bomber fleet.
www.af.mil
Northrop Grumman has won the right to build the U.S. Air Force’s next-generation bomber.
www.defensenews.com