B-21 Raider (US Air Force stealth bomber)

What it is

The B-21 Raider is the US Air Force's next-generation nuclear-capable stealth bomber, developed by Northrop Grumman under a contract awarded in October 2015. It is designed as the penetrating strike component of the modernized US nuclear triad, replacing the ageing B-1B Lancer and partially supplementing the B-2 Spirit. The aircraft is a low-observable flying-wing design, somewhat smaller and lighter than the B-2, built around next-generation stealth coatings, an open-systems avionics architecture, and advanced networking for contested environments. Its planned ordnance load includes the B61-12 and B61-13 nuclear gravity bombs and the AGM-181 LRSO nuclear cruise missile, as well as conventional munitions including the AGM-158C JASSM-ER. The US Air Force's program of record calls for at least 100 aircraft, with unit cost estimated at roughly US$700 million.

History

The Long Range Strike Bomber competition opened formally in 2014. In October 2015, the US Air Force awarded Northrop Grumman the Engineering and Manufacturing Development contract, defeating a Boeing-Lockheed Martin team. The program name was redesignated B-21 in 2016. The aircraft was publicly unveiled at Northrop's Plant 42 in Palmdale, California, on 2 December 2022, the first new American bomber shown publicly in more than three decades. The name honors the Doolittle Raiders: 80 volunteers who struck Tokyo on 18 April 1942 flying B-25 Mitchells from USS Hornet. The B-21 completed its maiden flight on 10 November 2023, a 51-minute sortie from Palmdale, formally opening the test campaign managed by the 412th Test Wing's B-21 Combined Test Force at Edwards Air Force Base in California.

Current state

As of mid-2026, the B-21 is in low-rate initial production at Palmdale, with at least six airframes in production concurrently. The test program has outpaced its schedule: a campaign planned for 180 days closed out in 73. On 11 June 2026, an operational pilot flew alongside a developmental test pilot, the earliest such integration in any US aircraft program, signaling the shift from airworthiness validation toward combat evaluation of weapons employment, crew effectiveness, and survivability against advanced air defenses. Congress added US$4.5 billion to the program in 2025 to accelerate production roughly 25 percent. The FY2027 US Department of Defense budget request added a further US$6.1 billion. First delivery to Air Force Global Strike Command's formal training unit at Ellsworth Air Force Base in South Dakota is targeted for 2027, followed by Whiteman Air Force Base in Missouri and Dyess Air Force Base in Texas.

Relationships

Northrop Grumman, headquartered in Falls Church, Virginia, holds the prime contract and manages both production at Palmdale and assembly integration. The B-21 sits alongside the Sentinel ICBM as the two Northrop Grumman-led legs of US nuclear modernization, though the contrast is stark: the Sentinel program was restructured in 2024 after costs ballooned past the Nunn-McCurdy threshold, while the B-21 has remained broadly on budget and schedule, a rare distinction in major US defense acquisition. With the New START treaty now lapsed and no follow-on arms-control framework in place, the B-21 carries additional strategic weight as the primary next-generation penetrating nuclear delivery system. The program is a leading driver of the broader US defense spending increase, commanding US$10.3 billion in the FY2026 budget alone.

What to watch

• Results from ongoing weapons-integration and survivability testing at Edwards Air Force Base, expected to inform a Milestone C production decision.
• Whether the accelerated Palmdale production rate holds through FY2027 given supply-chain and workforce constraints.
• Congressional debate over expanding the program of record beyond 100 aircraft, which some US Air Force officials have publicly advocated.
• The first operational B-21 squadron standing up at Ellsworth AFB, the trigger for credible nuclear patrol capability.
• Whether the B-21's advancing timeline influences US negotiating posture in any eventual nuclear diplomacy with China or Russia.