After almost 75 years of service, the United States is getting the ball rolling on investigating an eventual replacement for the venerable B-52 “Stratofortress.” This is not to say the United States Air Force (USAF) is planning to replace them; it is asking what heavy bombers should look like after it.

Current B-52s are already 74 years old, or so, by design, but their core airframes are mostly still viable. They have also undergone various phases of upgrades, including a planned B-52J package that should extend their serviceable life well into the 2050s.

According to reports, released documents as part of the Pentagon’s 2027 fiscal year include a request for something called “Heavy Bomber Analysis of Alternatives.” Part of those documents includes options for what is called an “ageless B-52,” an entirely new aircraft, or a mixture of both.

Key to this analysis is an investigation into the different approaches to bombing. The first is penetrating bombing using aircraft like the cutting-edge Northrop Grumman B-21 “Raider” stealth bomber.

Such craft use stealth to penetrate enemy airspace by evading radar to hit hardened targets using precision weapons. This includes things like command bunkers, nuclear facilities, missile silos, and air defense systems.

End of the road for the B-52?

Such attacks are very hazardous and tend to be limited in destructive potential, at least initially. The second is stand-off bombing using aircraft like the B-52.

Instead of entering enemy airspace, such bombers launch munitions like cruise missiles or hypersonic missiles from far away. With this strategy, the weapons themselves do the lion’s share of the dangerous transit into enemy airspace.

This enables the bombers to act like airborne missile launchers and is much safer and cheaper, comparatively. In this role, the B-52, despite its age, is still incredibly useful as it has an enormous payload capacity.

It can also carry a wide range of weapons from hypersonics to “dump” bombs, and everything else in between. B-21s, on the other hand, necessarily have smaller payloads due to their limitations from stealth requirements (i.e., internal payloads and no external hardpoints).

Penetrating bombers are also very expensive to design and build. More classic bombers like the B-52 are mechanically simpler, can be upgraded easily, and don’t require as much protection from air defense systems.

So, in short, why spend the time and money on a stealth bomber when you can upgrade or build 2, 4, or more stand-off bombers instead? Another key consideration is the re-engining program for the B-52 with Rolls-Royce engines.

Under this program, the ancient TF33 engines are being swapped out for more fuel-efficient, more robust, and reliable F130 engines. When combined with new radar and avionics, the B-52 gets yet another lease of life.

According to experts, the most likely inspiration for this debate is growing concerns over China. Specifically, the Pentagon is worried about the huge distances involved in the Pacific, and near-peer defensive capabilities like anti-access/area denial should a conflict erupt.

New bomber on the cards?

So, the USAF is now asking how many bombers it really needs, what munition packages they need to carry, and whether quantity is going to be better than quality.

The calculation is also complicated by the planned retirement of the B-1 “Lancer” in the 2030s. That creates a large gap for a high-speed, high-payload bomber for conventional strike and specialized missions.

This will likely trigger the need for a new replacement to fill the niche, as it is unlikely the B-52 or B-21 can be modified to fit the role. That could include a blend between the B-1 and B-52 in a future bomber.

“While the [B-52] aircraft is old, the airframe is still relatively young in terms of flight hours and the stresses it’s absorbed over the years,” Mark Gunzinger, a former deputy undersecretary of defense, told Air and Space Forces. “So it’s a perfectly viable airframe,” he added.

“I think it might be better characterized as saying, they’re taking a look at the stand-off strike mission area itself, and what’s the best solution for the distant future?” he added.