Gbu-57A/B Mop
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Description
The GBU-57 series MOP (Massive Ordnance Penetrator) is a 30,000-pound (14,000 kg) class, 20.5-foot-long (6.2 m) precision-guided munition "bunker buster" bomb -- the initials "GBU" stand for "Guided Bomb Unit" -- developed by Boeing for the United States Air Force (USAF). Composed of a BLU-127 bomb body and an integrated GPS/INS guidance package, there are seven GBU-57 variants. Due to its size and weight, the GBU-57 MOP can only be carried by the Northrop B-2 Spirit strategic bomber, although initial tests were conducted with the Boeing B-52 Stratofortress.
The first combat use of the GBU-57 MOP came on June 22, 2025, when seven Northrop B-2 Spirit stealth bombers dropped a total of fourteen GBU-57 bombs on Iran's Fordow Uranium Enrichment Plant and Natanz Nuclear Facility.
The bomb is much larger than earlier USAF bunker busters such as the 5,000-pound (2,300 kg) GBU-28 and GBU-37.
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- Slug: gbu-57ab-mop
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- Added: Jul 20, 2024