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Olive-drab GBU-43/B on a cradle, yellow nose and lattice grid fins, in front of the Air Force Armament Museum

Open-source breakout · 15 Oct 2026

MOAB BREAKOUT

GBU-43/B is a blast weapon. It is not a bunker-buster.

The nickname oversells it. Eleven tons of TNT will wreck a canyon mouth and a few ordinary blocks. It will not kill a lined hall under a mountain, and it will not erase a city.

Real file photo. Display round at the Air Force Armament Museum. Grid fins, yellow nose, “MOAB” on the body.

What it actually is

Massive Ordnance Air Blast. Air Force Research Laboratory, Al Weimorts, about nine weeks of design for Iraq 2003. Tested 11 March 2003 on Eglin Range 70. Never used there. About 15 built at McAlester Army Ammunition Plant. One expended.

Yield is about 11 tons TNT, 46 gigajoules. That is the blast neighborhood of the smallest US nuclear artillery round, with none of the nuclear effects. The fill is H6: RDX, TNT, aluminum powder, and wax. Aluminum stretches the pressure pulse. It is not a fuel-air explosive and it is not a thermobaric weapon. Those labels keep getting repeated. They are wrong.

The Air Force’s historical unit quote is about $170,000 in mid-2000s dollars. “$16 million” is not a unit price.

Job

MOAB. Surface blast, cave mouths, troops in the open

MOP. Defeat a buried, hardened volume

Mass

MOAB. About 21,700 lb

MOP. About 27,000 lb body, briefed as a 30,000 lb class weapon

Fill

MOAB. About 18,700 lb of H6

MOP. A few thousand pounds. The mass is the steel case

Case

MOAB. Thin aluminum, about 2,900 lb

MOP. Thick penetrator body

Size

MOAB. 30 ft 1.75 in long, 40.5 in diameter

MOP. 20.5 ft long, 31.5 in diameter

Guide

MOAB. GPS/INS, grid fins

MOP. GPS/INS

Carriage

MOAB. Ramp-extracted from an MC-130. No bomber bay

MOP. B-2 internal bay

Burst

MOAB. Airburst, by design

MOP. After it has penetrated

Combat

MOAB. Once. Achin, 13 April 2017

MOP. First use 22 June 2025, Midnight Hammer

Against a city

One aimpoint. The kill mechanism is overpressure, plus whatever the blast picks up. The case is aluminum, so this is not a classical thick-steel fragment bomb.

In the open, serious damage to ordinary buildings and exposed people is hundreds of meters, not a mile of leveled city. The “one mile blast radius” line is a press figure. Out there you are in broken glass and light damage. Streets and canyons duct the wave farther than flat ground. Reinforced frames lose facade and glass well outside the ring that guts a light building. They do not disappear.

There is no nuclear thermal pulse and no firestorm. A typical Vietnam Arc Light cell put roughly 10 to 17 MOAB-equivalents of high explosive across a box about 1.5 by 0.5 miles. One MOAB is one point inside that class of effort.

DoD aerial of a single dark smoke column rising from a ridge, with a sensor crosshair
Real DoD frame, 13 April 2017, Achin district, Nangarhar. One column on a ridge above a valley. No city in the picture. That is the honest scale.

Against a hardened target

The case is light on purpose, and the fuze is meant to burst above the surface so the energy runs sideways and into openings. A contact burst would dump a lot of it into a crater. It does not penetrate rock or reinforced concrete.

What it can do: collapse a cave mouth, a shallow unlined gallery, a trench, a soft bunker, and people or stores inside a confined valley. That was Achin. ISIS-K had gone into tunnels and IED belts, and the force on the ground could not clear them. Nicholson called it the right munition for that problem. Afghan accounts put some of those tunnels near 40 meters. That is not a lined, decoupled hall behind blast doors and turns.

An open portal and a short straight run can still kill inside. Doglegs, debris plugs, and a real blast door are how you beat an airburst. The deep door is a MOP problem.

Generated. Notional, empty, and not the 2017 strike. Read it as mechanism only: the portal takes the blast, the door is still there. A city clip was cut because the generator drew a nuclear-scale column over a whole district.

The weapon built for the buried problem is the GBU-57 Massive Ordnance Penetrator. Midnight Hammer, 22 June 2025: seven B-2s released 14 of them, 12 on Fordow and 2 on Natanz. Open reporting puts Fordow’s halls on the order of 80 meters down, and even the penetrator is argued at that depth. Open sources also record later MOP use in 2026. MOAB was never the tool for that target.

US Air Force test photo of a B-2 releasing a GBU-57 Massive Ordnance Penetrator
Real USAF test photo, not a combat frame. The penetrator leaves a bomber bay. The MOAB leaves a cargo ramp.

The limit is the airplane

  • A drogue extracts the cradle off the ramp, then comes off. The bomb free-falls. It is not a parachute-retarded weapon all the way down, and it has no standoff.
  • It was designed around the MC-130H. That jet is retired. It still will not fit a bomber bay. Against any real air defense, the release aircraft is the vulnerable part. Achin was a permissive valley.
  • GPS/INS, a handful of rounds, one combat shot. Achin casualty counts were never clean: Afghan figures ran from 36 into the mid-90s, including commanders. ISIS denied losses. A small number of civilian deaths was alleged. The Pentagon’s first statements had no solid damage number.

Use a MOAB on an area, a canyon, or a tunnel mouth you can fly a C-130 to. Use MOPs, in trains, on a volume that is actually buried. Do not brief the nickname.

Open-source order of magnitude. Not a weaponeering solution and not a classified damage estimate. Overpressure rings depend on burst height, terrain, and construction.