The War Zone (Tyler Rogoway et al.) · unexplained· 8 min
Next Generation Penetrator Bomb Slated To Replace MOP Has Been Designated GBU-76
The Air Force is getting ready to replace its massive GBU‑57 “bunker buster” with a next‑generation version that’s now been labeled the GBU‑76. The new bomb, called the Next Generation Penetrator, will keep the core idea of a huge, deep‑penetrating warhead but is expected to bring a suite of upgrades—new fuzes that can count floors or sense voids, a more flexible navigation system that can still find its mark when GPS is jammed, and possibly a rocket‑boosted tail to push it farther into hardened targets. The service has just put out a market‑research notice looking for contractors who can handle everything from design and testing to production and logistics for the GBU‑76. Vendors will need to show they can work on the bomb’s fuze, explosive filler, alternate navigation package, and overall integration. The request also asks for support on mission‑planning software, training tools, and the whole supply chain that gets the weapon from the factory to the aircraft. Weight‑wise the new penetrator is likely to sit in the 20‑to‑30‑ton range, similar to the current MOP’s 30‑ton class. That means the warhead itself could be around 22,000 pounds, with the full system possibly a bit heavier. Keeping the bomb lighter or more compact would help it fit on the upcoming B‑21 Raider, which can only carry one of these huge weapons at a time, unlike the B‑2 that can take two. Prototyping is slated to wrap up by the end of fiscal 2028, with the first operational units expected sometime after that. Boeing, which built the existing MOP, will handle the tail kit and overall integration, while Applied Research Associates is already working on full‑scale prototypes. The older GBU‑57 won’t be retired right away; the Air Force plans to keep upgrading its tail kit and fuze while the new system comes online. All of this is part of a broader push to stay ahead of deep‑buried threats—whether they’re Iranian nuclear sites, Russian underground bases, or Chinese missile silos. The next‑gen bomb aims to match or exceed the MOP’s performance, giving the U.S. a tool that can still punch through the toughest, most concealed targets.