{"id":28724331,"date":"2026-10-19T14:01:16","date_gmt":"2026-10-19T12:01:16","guid":{"rendered":"https:\/\/migflug.com\/afterburner\/?p=28724331"},"modified":"2026-10-19T14:01:30","modified_gmt":"2026-10-19T12:01:30","slug":"moab-gbu-43-mother-of-all-bombs-explained","status":"publish","type":"post","link":"https:\/\/migflug.com\/afterburner\/it\/moab-gbu-43-mother-of-all-bombs-explained\/","title":{"rendered":"MOAB: The &ldquo;Mother of All Bombs&rdquo; Explained"},"content":{"rendered":"<style>.et_pb_title_container h1.entry-title { padding-top: 40px !important; }<\/style>\n<!-- mfsh:top -->\n\n<style>\n.mfsh-trigger{display:inline-flex;align-items:center;gap:10px;height:44px;padding:0 18px;margin:0 0 26px;border:2px solid #0F1720;background:#fff;color:#0F1720;font-family:inherit;font-size:14px;font-weight:700;line-height:1;letter-spacing:0;text-transform:none;cursor:pointer;box-shadow:none;transition:background .15s,color 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The GBU-43\/B Massive Ordnance Air Blast, better known by its unofficial name, the &ldquo;Mother of All Bombs&rdquo;, weighs nearly ten tonnes and is pulled out of the rear cargo door of a C-130 by a parachute. It has been used in combat exactly once, in Afghanistan in April 2017. In October 2026 it was back in the news, when CNN reported, citing US officials, that plans had been drawn up to use it against Iran.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Here is what the MOAB actually is, how it works, and why it is not the weapon many people think it is.<\/p>\n\n\n\n<div style=\"background:#f5f5f5;border-left:4px solid #1a1a1a;padding:18px 22px;margin:24px 0\"><p style=\"margin:0 0 8px;font-weight:600\">Quick Facts<\/p><ul style=\"margin:0;padding-left:20px\"><li><strong>Designation:<\/strong> GBU-43\/B Massive Ordnance Air Blast (MOAB)<\/li><li><strong>Designer:<\/strong> Albert L. Weimorts Jr., Air Force Research Laboratory<\/li><li><strong>Total weight:<\/strong> 21,715 lb (9,850 kg)<\/li><li><strong>Explosive:<\/strong> 18,739 lb (8,500 kg) of H-6<\/li><li><strong>Yield:<\/strong> About 11 tons of TNT<\/li><li><strong>Length \/ diameter:<\/strong> About 30 ft (9.2 m) \/ 40.5 in (103 cm)<\/li><li><strong>Guidance:<\/strong> GPS, with grid fins for control<\/li><li><strong>Carrier:<\/strong> MC-130 special operations variants of the C-130<\/li><li><strong>First test:<\/strong> 11 March 2003, Eglin AFB, Florida<\/li><li><strong>Combat use:<\/strong> Once: 13 April 2017, Achin district, Afghanistan<\/li><li><strong>Built:<\/strong> About 15, according to published reporting<\/li><\/ul><\/div>\n\n\n<h2 style=\"padding-top:22px\">From Daisy Cutter to MOAB<\/h2>\n\n\n<p class=\"wp-block-paragraph\">The MOAB grew out of an older weapon. In late 2001, US forces in Afghanistan dropped BLU-82 &ldquo;Daisy Cutter&rdquo; bombs, 15,000-lb weapons originally used in Vietnam to clear helicopter landing zones in the jungle. They were judged effective, not least as a weapon of intimidation. The Air Force Research Laboratory at Eglin Air Force Base in Florida was asked for something bigger and more accurate, and Al Weimorts designed it in 2002. Production followed at the McAlester Army Ammunition Plant in Oklahoma.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\" style=\"margin:0 0 24px;width:100%\"><img decoding=\"async\" class=\"skip-lazy\" data-no-lazy=\"1\" loading=\"eager\" width=\"1024\" src=\"https:\/\/migflug.com\/afterburner\/wp-content\/uploads\/sites\/4\/2026\/10\/moab-creator-al-weimorts-gbu-43-prototype-1024x676.jpg\" alt=\"Al Weimorts, creator of the GBU-43\/B MOAB, with the bomb\" style=\"width:100%;height:auto;max-width:100%;display:block\"><figcaption style=\"font-size:13px;color:#777;text-align:center;margin-top:6px;font-style:italic\">Al Weimorts (right), who designed the MOAB at the Air Force Research Laboratory. Photo: US Air Force, public domain.<\/figcaption><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">The official name, Massive Ordnance Air Blast, was chosen so that the acronym spelled MOAB. The nickname followed almost immediately, echoing Saddam Hussein&rsquo;s &ldquo;mother of all battles&rdquo; from the 1991 Gulf War.<\/p>\n\n\n<h2 style=\"padding-top:22px\">The 2003 Tests<\/h2>\n\n\n<p class=\"wp-block-paragraph\">The first MOAB was dropped on 11 March 2003 on Range 70 at Eglin, nine days before the invasion of Iraq. The timing was widely read as a message to Saddam Hussein&rsquo;s forces. That first test bomb was filled with tritonal; production weapons use H-6. Reports at the time said the mushroom cloud could be seen about 20 miles away. A second test followed on 21 November 2003.<\/p>\n\n\n\n<div style=\"position:relative;padding-bottom:56.25%;height:0;overflow:hidden;margin:24px 0\"><iframe class=\"skip-lazy\" data-no-lazy=\"1\" loading=\"eager\" src=\"https:\/\/www.youtube.com\/embed\/FDj3Nbs7pcQ\" style=\"position:absolute;top:0;left:0;width:100%;height:100%;border:0\" allowfullscreen><\/iframe><\/div>\n\n\n\n<p style=\"font-size:13px;color:#777;text-align:center;margin:-14px 0 24px;font-style:italic\">The 2003 MOAB test at Eglin, from the BBC News archive.<\/p>\n\n\n<h2 style=\"padding-top:22px\">How It Works<\/h2>\n\n\n<p class=\"wp-block-paragraph\">The MOAB is a blast weapon, not a penetrator. It sits on a cradle on an airdrop platform inside an MC-130. Over the release point, a drogue parachute pulls the platform out of the cargo door; the bomb then separates and falls free, steered to its target by GPS guidance and four large lattice-shaped grid fins at the tail. It detonates just above the ground.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Most of its weight is explosive. The thin aluminium casing weighs only about 2,900 lb, leaving some 18,700 lb of H-6, an aluminised high explosive. The result is a huge, long-lasting pressure wave that spreads across the surface and into confined spaces such as valleys, caves and tunnel entrances. That is exactly what it was designed for: soft and medium targets, troops and equipment over a wide area, and terrain that funnels the blast.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\" style=\"margin:0 0 24px;width:100%\"><img decoding=\"async\" class=\"skip-lazy\" data-no-lazy=\"1\" loading=\"eager\" width=\"1024\" src=\"https:\/\/migflug.com\/afterburner\/wp-content\/uploads\/sites\/4\/2026\/10\/moab-gbu-43-grid-fins-air-force-armament-museum.jpg\" alt=\"Grid fins of the GBU-43\/B MOAB at the Air Force Armament Museum, Eglin\" style=\"width:100%;height:auto;max-width:100%;display:block\"><figcaption style=\"font-size:13px;color:#777;text-align:center;margin-top:6px;font-style:italic\">The MOAB&rsquo;s grid fins, on the example displayed at the Air Force Armament Museum at Eglin. Photo: Fl295, public domain.<\/figcaption><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">To put the yield in context: about 11 tons of TNT is enormous for a single conventional bomb, but tiny compared with a nuclear weapon. The Hiroshima bomb released the equivalent of roughly 15,000 tons. And a typical B-52 Arc Light raid in Vietnam delivered as much explosive as 10 to 17 MOABs, spread over a much larger area.<\/p>\n\n\n<h2 style=\"padding-top:22px\">Achin, April 2017<\/h2>\n\n\n<p class=\"wp-block-paragraph\">The MOAB&rsquo;s only combat use came at about 7:32 p.m. local time on 13 April 2017. An MC-130 released one over a tunnel and cave complex used by the Islamic State&rsquo;s Afghan branch, Islamic State&ndash;Khorasan Province, in Achin district, Nangarhar province, close to the Pakistani border. The tunnels had originally been built in the 1980s for the mujahideen fighting the Soviet occupation. General John Nicholson, the US commander in Afghanistan, approved the strike. Days earlier, Army Special Forces Staff Sergeant Mark De Alencar had been killed in fighting in the same province.<\/p>\n\n\n\n<div style=\"position:relative;padding-bottom:56.25%;height:0;overflow:hidden;margin:24px 0\"><iframe class=\"skip-lazy\" data-no-lazy=\"1\" loading=\"eager\" src=\"https:\/\/www.youtube.com\/embed\/Q6rSxJnpGNg\" style=\"position:absolute;top:0;left:0;width:100%;height:100%;border:0\" allowfullscreen><\/iframe><\/div>\n\n\n\n<p style=\"font-size:13px;color:#777;text-align:center;margin:-14px 0 24px;font-style:italic\">Footage of the April 2017 strike released by the US military, via PBS NewsHour.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Casualty figures remain uncertain. Afghan officials first said 36 militants were killed, then raised the figure to more than 90. Islamic State denied it had lost anyone, and a local member of parliament reported that residents said a teacher and his young son were killed. The Afghan army said there were no civilian casualties. Reporters who later reached the area found trees still standing about 100 metres from the impact point, and many similar caves nearby. Fighting in the valley continued.<\/p>\n\n\n<h2 style=\"padding-top:22px\">What the MOAB Cannot Do<\/h2>\n\n\n<p class=\"wp-block-paragraph\">The MOAB is often confused with the US Air Force&rsquo;s other giant bomb, the 30,000-lb GBU-57 Massive Ordnance Penetrator. They are opposites. The MOP is heavy and narrow, with a thick steel case built to punch through rock and concrete before exploding; it was used against Iran&rsquo;s Fordow enrichment site in June 2025, and we covered later strikes in <a href=\"https:\/\/migflug.com\/afterburner\/b-2s-drop-30000-lb-bunker-busters-on-irgc-underground-hq\/\">B-2s Drop 30,000-lb Bunker Busters<\/a>. The MOAB has a thin case and explodes above the surface. Against a facility buried deep underground, it would do little more than damage what is on top.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">That is why the October 2026 reports about Iran drew sceptical responses. According to the CNN reporting, plans covered Iranian energy infrastructure and nuclear sites if President Trump ordered renewed strikes, but officials themselves doubted the MOAB would help achieve US goals such as destroying Iran&rsquo;s nuclear capabilities. Military analysts quoted by Al Jazeera made the same point: the bomb is designed to produce a powerful blast across a surface area, not to reach deeply buried sites.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">It also cannot be carried by a stealth bomber or a fighter. It needs a cargo aircraft flying over the target, which limits its use to airspace the US controls.<\/p>\n\n\n<h2 style=\"padding-top:22px\">Mother vs. Father<\/h2>\n\n\n<p class=\"wp-block-paragraph\">In 2007 Russia announced its own giant bomb, the ATBIP, which it promptly dubbed the &ldquo;Father of All Bombs&rdquo;. Russia claimed a yield equivalent to 44 tons of TNT, four times the MOAB&rsquo;s, from a lighter weapon of about 7.1 tonnes. Those figures have never been independently verified and are disputed. And the MOAB is not the heaviest bomb ever dropped: Britain&rsquo;s 22,000-lb Grand Slam of 1945 weighed slightly more, although about half of that was its steel case. We tell the story of Barnes Wallis&rsquo;s earthquake bombs in <a href=\"https:\/\/migflug.com\/afterburner\/tallboy-grand-slam-barnes-wallis-earthquake-bombs\/\">Tallboy and Grand Slam<\/a>.<\/p>\n\n\n<h2 style=\"padding-top:22px\">Explained in Under Five Minutes<\/h2>\n\n\n<div style=\"position:relative;padding-bottom:56.25%;height:0;overflow:hidden;margin:24px 0\"><iframe class=\"skip-lazy\" data-no-lazy=\"1\" loading=\"eager\" src=\"https:\/\/www.youtube.com\/embed\/fIRSLk_3FCE\" style=\"position:absolute;top:0;left:0;width:100%;height:100%;border:0\" allowfullscreen><\/iframe><\/div>\n\n\n\n<p style=\"font-size:13px;color:#777;text-align:center;margin:-14px 0 24px;font-style:italic\">A short explainer on the MOAB from Voice of America.<\/p>\n\n\n<h2 style=\"padding-top:22px\">Common Myths<\/h2>\n\n\n<p class=\"wp-block-paragraph\"><strong>&ldquo;It is a thermobaric bomb.&rdquo;<\/strong> It is often called one, but strictly it is not a fuel-air weapon: its H-6 fill is a solid aluminised explosive, carried inside the case, not a fuel cloud dispersed and then ignited. <strong>&ldquo;It is a bunker buster.&rdquo;<\/strong> No, that is the GBU-57. <strong>&ldquo;It is the most powerful non-nuclear weapon ever.&rdquo;<\/strong> It was the most powerful in the US arsenal when it was developed; Russia claims its FOAB is more powerful, and the Grand Slam was heavier.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><em>Sources: US Department of Defense, &ldquo;What to Know About the GBU-43\/B&rdquo; (DoD Live, 14 April 2017); US Air Force and Air Force Armament Museum, Eglin AFB; Los Angeles Times (12 March 2003, and Al Weimorts obituary, 27 December 2005); Defense News; The New York Times, The Guardian and CBS News (13 April 2017); Stars and Stripes, on the Afghan death toll; Deutsche Welle and Wired (2007), on the Russian FOAB claims; Al Jazeera, &ldquo;What is the &lsquo;Mother of All Bombs&rsquo; US could use in Iran?&rdquo; (15 October 2026), citing CNN; BBC News; PBS NewsHour; Voice of America.<\/em><\/p>\n\n\n<!-- mfsh:bottom -->\n\n<button type=\"button\" class=\"mfsh-trigger mfsh-bottom\" data-mfsh-placement=\"bottom\" aria-haspopup=\"dialog\"><svg><use href=\"#mfsh-i-share\"\/><\/svg>Share this story<\/button>\n\n<!-- \/mfsh:bottom -->\n\n\n<style>.mfq{margin:34px 0 8px}.mfq h2{font:26px\/1.3 \"Gilroy semiBold\",Helvetica,Arial,sans-serif;color:#0d1117;padding-top:22px;margin:0 0 6px}.mfq .qa details{border-top:1px solid #5C91FF;margin:0;padding:0}.mfq .qa details:last-of-type{border-bottom:1px solid #e2e7ee}.mfq .qa summary{cursor:pointer;list-style:none;display:flex;justify-content:space-between;align-items:center;gap:16px;padding:22px 26px;font:18px\/1.7 \"Gilroy semiBold\",Helvetica,Arial,sans-serif;color:#0d1117}.mfq .qa summary::-webkit-details-marker{display:none}.mfq .qa summary::after{content:\"+\";font:24px Helvetica,sans-serif;color:#3568e0;flex:0 0 auto}.mfq .qa details[open] summary::after{content:\"\\2013\"}.mfq .qa details:hover summary{color:#3568e0}.mfq .qa .a{font:16px\/1.7 \"Gilroy regular\",Helvetica,Arial,sans-serif;color:#454e5e;padding:0 26px 24px}.mfq .qa .a a{color:#3568e0}@media(max-width:680px){.mfq .qa summary{padding:18px 14px;font-size:17px}.mfq .qa .a{padding:0 14px 20px}}<\/style>\n\n\n<section class=\"mfq\"><h2>Frequently Asked Questions<\/h2><div class=\"qa\"><details open><summary>What is the MOAB bomb?<\/summary><div class=\"a\">The GBU-43\/B Massive Ordnance Air Blast, nicknamed the &ldquo;Mother of All Bombs&rdquo;, is a GPS-guided US bomb weighing 21,715 lb (9,850 kg), of which about 18,700 lb is H-6 explosive. It detonates just above the ground to create a huge blast wave and has a yield of about 11 tons of TNT.<\/div><\/details><details><summary>How is the MOAB dropped?<\/summary><div class=\"a\">The MOAB is too large for any bomber. It is carried on a cradle inside an MC-130 cargo aircraft; a drogue parachute pulls it out of the rear cargo door, then the bomb falls free, guided by GPS and steered by four grid fins.<\/div><\/details><details><summary>Has the MOAB ever been used in combat?<\/summary><div class=\"a\">Once. On 13 April 2017 a US MC-130 dropped a MOAB on an Islamic State&ndash;Khorasan Province tunnel complex in Achin district, Nangarhar province, Afghanistan. Afghan officials put the death toll at more than 90 militants; Islamic State denied losses, and local reports of civilian deaths were disputed.<\/div><\/details><details><summary>Is the MOAB a bunker buster?<\/summary><div class=\"a\">No. The MOAB has a thin aluminium case and explodes above the surface. The US bunker buster is the 30,000-lb GBU-57 Massive Ordnance Penetrator, which has a thick steel case designed to penetrate rock and concrete before detonating.<\/div><\/details><details><summary>Is the MOAB a thermobaric weapon?<\/summary><div class=\"a\">The MOAB is often described as thermobaric, but strictly it is not a fuel-air weapon. Its H-6 filling is a solid aluminised high explosive, which boosts the blast but is not dispersed as a fuel cloud before ignition.<\/div><\/details><details><summary>How powerful is the MOAB compared with a nuclear bomb?<\/summary><div class=\"a\">The MOAB&rsquo;s yield of about 11 tons of TNT is huge for a conventional bomb but tiny next to nuclear weapons: the Hiroshima bomb released roughly 15,000 tons of TNT equivalent.<\/div><\/details><details><summary>What is the Father of All Bombs?<\/summary><div class=\"a\">The &ldquo;Father of All Bombs&rdquo; is a Russian air-dropped bomb announced in 2007. Russia claimed a yield of 44 tons of TNT, about four times the MOAB&rsquo;s, but those figures have not been independently verified and are disputed.<\/div><\/details><details><summary>Could the US use the MOAB against Iran?<\/summary><div class=\"a\">In October 2026, CNN reported, citing US officials, that plans existed to use the MOAB against Iranian energy infrastructure and nuclear sites if President Trump ordered renewed strikes. The same reporting said officials doubted it would help destroy Iran&rsquo;s deeply buried nuclear facilities, which the MOAB is not designed to penetrate.<\/div><\/details><\/div><\/section>\n\n\n\n<script type=\"application\/ld+json\">{\"@context\":\"https:\/\/schema.org\",\"@type\":\"FAQPage\",\"mainEntity\":[{\"@type\":\"Question\",\"name\":\"What is the MOAB bomb?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"The GBU-43\/B Massive Ordnance Air Blast, nicknamed the \\\"Mother of All Bombs\\\", is a GPS-guided US bomb weighing 21,715 lb (9,850 kg), of which about 18,700 lb is H-6 explosive. It detonates just above the ground to create a huge blast wave and has a yield of about 11 tons of TNT.\"}},{\"@type\":\"Question\",\"name\":\"How is the MOAB dropped?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"The MOAB is too large for any bomber. 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The same reporting said officials doubted it would help destroy Iran\u2019s deeply buried nuclear facilities, which the MOAB is not designed to penetrate.\"}}]}<\/script><div style=\"background:#f0f4ff;border-left:4px solid #5C91FF;padding:16px 20px;margin:32px 0 8px\">\n<p style=\"margin:0 0 8px;font-weight:600;color:#333\">Related Posts<\/p>\n<p style=\"margin:4px 0\"><a href=\"https:\/\/migflug.com\/afterburner\/tallboy-grand-slam-barnes-wallis-earthquake-bombs\/\">The Bomb Designed to Miss<\/a><\/p>\n<p style=\"margin:4px 0\"><a href=\"https:\/\/migflug.com\/afterburner\/b-2s-drop-30000-lb-bunker-busters-on-irgc-underground-hq\/\">B-2s Drop 30,000-lb Bunker Busters on IRGC Underground HQ<\/a><\/p>\n<p style=\"margin:4px 0\"><a href=\"https:\/\/migflug.com\/afterburner\/usaf-149m-large-penetrator-warhead-case-contracts-2026\/\">USAF Awards $149M for Bunker Buster Warhead Cases<\/a><\/p>\n<\/div>\n\n\n","protected":false},"excerpt":{"rendered":"<p>At nearly 10 tonnes, the GBU-43\/B MOAB is the biggest conventional bomb the US has ever used in combat. It is too big for any bomber and rolls out of the back of a cargo plane. Here is how it works, where it has been used, and what it cannot do.<\/p>","protected":false},"author":23,"featured_media":28724189,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"editor_notices":[],"footnotes":""},"categories":[664],"tags":[],"class_list":["post-28724331","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-military-aviation"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.7 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>MOAB Explained: GBU-43 Mother of All Bombs, Tests &amp; Combat | MiGFlug<\/title>\n<meta name=\"description\" content=\"The GBU-43\/B MOAB weighs nearly 10 tonnes and is dropped out of the back of a cargo plane. 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