Ellsworth Air Force Base (RCA) was selected to be the first main operating base of the Northrop Grumman B-21 Raider. Located in South Dakota, the base has been home to the Rockwell B-1B Lancer, a supersonic swing-wing bomber. Although the B-21 is a less delicate plane than the NG B-2 Spirit, rebuilding the base in order to prepare for its first stealth aircraft comes at a cost of nearly $2 billion to taxpayers.

As the world’s first sixth-generation warplane, the B-21 is a very different machine from the preceding platform hosted at Ellsworth. Two other bases have been selected as MOBs, including Dyess AFB in Texas and Whiteman AFB. Notably, while the $1.6 billion in work at Dyess will be very similar to Ellsworth, Whiteman is currently the home of the B-2. That is expected to streamline renovations and potentially reduce spending by as much as $1 billion, which is also related to why it will be transitioned last.

There are two main factors driving the cost of the current construction projects: stealth technology and nuclear munitions. The B-1B featured some low observable characteristics but did not have a radar absorbent material coating similar to the B-2 or the more advanced form of RAM on the B-21. The Raiders are designed to be more rugged, but special facilities still need to be available in order to perform maintenance. Similarly, the storage and deployment of nuclear armaments require specialized handling equipment and infrastructure.

A New Era: Enter The Raider

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The B-1 ‘Bone,’ as it is known, was essentially a conventionally constructed airplane with advanced aerodynamics, including its iconic swing wings, and very powerful engines that propelled it to supersonic speeds. Maintaining the Bone was akin to maintenance on a very large fighter bomber, with much of the focus being on aerostructures and wear and tear from G forces. It was built from aluminum and titanium, which is a very different airframe from the composite-constructed, RAM-coated B-21.

One of the essential maintenance facilities required to sustain the radar is a stealth restoration bay. These are tightly sealed sterile environments with advanced climate control and high-end air filtration systems that can handle toxic chemical sprays and composite dust. The B-21 does not require the white-glove treatment of the B-2 on every single sortie; however, it does require a unique approach to repair and routine care.

Another vital part of keeping a fleet of stealth bombers combat-ready is ensuring that they are actually stealthy before they take off on a mission. To that end, radio frequency shielded hangars, also known as anechoic chambers, provide an environment isolated from the electromagnetic spectrum in the atmosphere. This allows for precise testing to confirm that any work done to the B-21 does not compromise its stealth and validates that it is within the parameters expected.

Some other noteworthy differences between the B-1 and B-21 are that the Raider is actually mechanically less complex and a smaller aircraft in terms of physical footprint on the flight line. While it may have a more ‘exquisite’ paint job on the exterior surfaces, its internal systems have far fewer moving parts. Additionally, the B-21 has a similar wingspan to the B-1 but is a much shorter aircraft. Its wingspan is also significantly less than that of the B-2, which allows it to fit into universal standards codified by the North Atlantic Treaty Organization for fighter jet hangars and shelters.

First And Foremost: Force Readiness

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The B-21 Raider has been one of the smoothest defense procurement programs in Air Force history, with virtually no cost overruns or schedule delays. The execution of the B-21 development was powerfully informed by the notoriously expensive and troubled B-2 Spirit fleet. The fifth-generation flying wing that blazed the trail for the Raider suffered sustainment issues after its abbreviated production run, which generated a ‘what not to do’ list for the Air Force.

One of the final areas in which the USAF still has a significant amount of preparation to do is the airfields, aircrew, and technicians. Air and Space Forces Magazine interviewed Air Force Secretary Troy Meink, who remarked on the ongoing effort to ensure that force readiness is a top priority for the USAF. Meink gave this statement to Air and Space Forces:

“Do we have the right technicians with the right training, mechanics, on there? We’re looking at growing the force to provide more for that, particularly as we expand and start delivering some of these new weapon systems [such as the] B-21.”

The B-21 features many major engineering innovations that are intended to make it both easier to work on and easier to upgrade throughout the lifetime of the fleet. The stronger RAM coatings are just the tip of the iceberg. The jet also features only two engines, unlike the quadjet B-2, with its internal systems also being installed with a modular architecture.

The significant reduction in moving parts compared to the B-1 and more modern digital systems will make the plane far less maintenance-intensive than the Lancer or the Spirit.

Restructuring The Bomber Fleet

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Ensuring the force is ready goes hand in hand with preparing the bases they will work on. Since entering office, Meink has worked alongside Chief of Staff Gen. Kenneth S. Wilsbach to steadily improve the fleet’s combat capability. Looking beyond airplanes and air bases, he also explained that major endeavors are underway to ensure that the Air Force will have enough maintainers, with high-quality training, to ensure a resilient force well into the future.

Meink expects at least one of the two flying B-21 test aircraft to arrive at Ellsworth in 2027, where operational squadrons will begin familiarizing themselves with the planes. This will also allow the first cadre of maintainers to put their hands on the Raider to gain practical experience working on a new generation of bomber. That also means that housing and troop amenities are being expanded at Ellsworth, Dyess, and Whiteman alongside the restructuring of the Air Force Global Strike Command.

These three bases will be the first, but as the USAF moves towards a two-type bomber fleet, more bases are likely to come online with partial or full support infrastructure. Additionally, while the Air Force is already expected to receive 100 examples of the B-21, top brass is already calling for more airframes. There are forecasts that the total delivery may climb to 145 or even 185 Raiders before the assembly line is spun down.

The New AFGSC Fleet

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The arrival of the B-21 at Ellsworth is a dramatic acceleration of the original operational service timeline, which is directly connected to the increased funding for accelerated production. Northrop Grumman and the Air Force reached a deal earlier this year to increase the production capacity of the B-21 line by 25% to accelerate the AFGSC fleet transition. The B-2 will serve a few years longer than the B-1, but the USAF is also aggressively pursuing its overhaul of the Boeing B-52 Stratofortress fleet.

By focusing resources strictly on the B-21 and the B-52, AFGSC drastically cuts costs with a simplified training and logistical support network. It also allows AFGSC to roll out a controlled, chronological construction schedule across the three bases. Rather than overextending the defense budget by upgrading all three installations simultaneously. Whiteman will be the last base because it currently hosts B-2, which will continue to serve until the final deliveries of B-21 arrive, and the base requires very little overhaul to accommodate the new Raider.

Because the fleet was shrinking to just two bombers, Ellsworth was designated as the primary Formal Training Unit and the first Main Operating Base. It must absorb the first wave of aircraft. Because the B-21 was engineered using highly advanced digital modeling, the early test airframes were built with internal mission systems that are nearly identical to final production models. Moving this test aircraft to Ellsworth allows maintenance crews and pilots to begin hands-on integration training immediately while continuing flight trials onsite.

MOB 2: Dyess AFB, Texas

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At Dyess, the shift from the old B-1 to the B-21 is causing a massive shake-up, according to Air and Space Forces Magazine. The USAF officially kicked off what they call a ‘decade of construction’ on December 15, 2025. Right now, work is focused on completely overhauling the flight line’s fueling infrastructure. Crews have broken ground on a specialized $26 million fuel testing laboratory and a massive high-capacity refueling truck yard.

The fuel lab allows maintenance crews to rapidly test, flush, and balance these smart fuel cells using high-speed, closed-loop pressure systems without having to open up the aircraft’s skin. Because the software tells the ground crews exactly how the fuel lines are performing in real-time, the base can refuel the aircraft, run automated diagnostics, and clear the jet for its next flight in a fraction of the time it takes to service a legacy bomber.

MOB 3: Whiteman AFB

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Over at Whiteman, the strategy is much more about surgical insertion rather than a total teardown. Because the base already handles the stealth B-2 Spirit, they do not need to reinvent the wheel, but they do need to bring some legacy infrastructure into the 21st Century. The base is still in the demolition phase, but it is ramping up to make ground support much more efficient than it was with the Spirit. If a B-2’s stealth signature needs deep electronic verification, it often involves complex scheduling or flying the aircraft to specialized, remote testing ranges.

Whiteman’s new dedicated $50-100 million RF hangar will let ground crews roll a B-21 straight into this single-bay facility and perform full test batteries on site, as Higher Gov outlines. Demolition crews recently flattened the old vehicle maintenance compound near the flight line to make room for the 57,000-square-foot (5,300 sq m) RF testing chamber. At the same time, engineers are quietly upgrading the security systems in Whiteman’s existing underground nuclear weapons storage vaults to ensure they meet the specific, modern cybersecurity requirements of the incoming Raider.