GBU-57
General Information:
Performance:
Dimensions:
Warhead:
Additional Notes:
The GBU-57 remains a critical part of the U.S. Air Force’s arsenal, maintained in limited numbers (estimated 20–50 units, though exact figures are classified). It has not been used in combat but is regularly tested and upgraded to counter advancements in enemy fortifications. Its strategic role is to provide a non-nuclear option for destroying high-value, fortified targets that are impervious to smaller munitions.
The need for a weapon like the GBU-57 emerged in the post-9/11 era, driven by the U.S. military's focus on countering hardened and deeply buried targets (HDBTs), particularly in countries like Iran and North Korea, where underground facilities were suspected of housing WMD programs. Existing bunker-busting munitions, such as the GBU-28, lacked sufficient penetration capability for modern, deeply buried targets.
Development (2004–2008): The U.S. Air Force, in collaboration with the Defense Threat Reduction Agency (DTRA), initiated the MOP program in the mid-2000s. Boeing was selected as the primary contractor to design a bomb capable of penetrating deeper and carrying a larger explosive payload than previous munitions. The GBU-57 was developed under a classified program, with initial contracts awarded around 2004.
Testing (2007–2011): The first successful test of the GBU-57 occurred in 2007 at the White Sands Missile Range, New Mexico, using a B-52 Stratofortress. Further tests confirmed its integration with the B-2 Spirit, the primary delivery platform, due to its stealth and payload capacity. By 2011, the bomb was deemed operational, with multiple test drops validating its penetration and guidance systems.
Upgrades (2012–Present): The GBU-57 has undergone several upgrades, resulting in variants like GBU-57A/B through GBU-57F/B. Improvements focused on enhancing the smart fuse (Large Penetrator Smart Fuze, LPSF), guidance accuracy, and penetration capabilities. A significant upgrade contract was awarded to Boeing in 2018 for further refinements, ensuring the bomb's effectiveness against evolving HDBT designs.
Strategic Context: The MOP was developed with potential adversaries like Iran and North Korea in mind, particularly their underground nuclear and missile facilities (e.g., Iran’s Fordow enrichment site). While never used in combat, its existence serves as a deterrent and a key component of U.S. strategic planning for preemptive or retaliatory strikes.
General Information:
- Origin: United States
- Manufacturer: Boeing
- Guidance Method: GPS-aided Inertial Navigation System (GPS/INS) with grid fins for in-flight stabilization and mid-course adjustments
- Mission: To penetrate and destroy hard and deeply buried targets, such as underground bunkers, command centers, and facilities potentially housing weapons of mass destruction (WMDs)
- Targets: Deeply buried, heavily fortified underground facilities, including nuclear bunkers, command and control centers, and WMD storage sites
- Platforms: B-2 Spirit stealth bomber (primary), tested on B-52 Stratofortress, planned for future integration on B-21 Raider
Performance:
- Accuracy: GPS/INS guidance ensures high precision, capable of hitting the same target point with multiple bombs for enhanced penetration
- Range: Up to 15nm when dropped from high altitude, though exact range depends on deployment altitude and platform
https://www.airandspaceforces.com/weapons-platforms/gbu-31-32-38-jdam/
Dimensions:
- Length: 20.5 feet
- Weight: Approximately 30,000 pounds (13,600 kg)
Warhead:
- Type: BLU-127 series warhead, containing a mix of high-performance explosives
- Explosive Composition: Approximately 4,590 pounds of AFX-757 and 752 pounds of PBXN-114, totaling ~5,342 pounds (2,423 kg) of high explosive
- Casing: High-density Eglin steel alloy, designed to withstand extreme stresses of deep penetration
- Type: Smart fuse (Large Penetrator Smart Fuze, LPSF) with void-sensing and delay capabilities, allowing detonation at optimal depth or upon detecting a cavity in the target structure
https://english.iswnews.com/37969/military-knowledge-gbu-57-massive-ordnance-penetrator/
https://www.twz.com/air/massive-ord...-buster-grows-more-potent-thanks-to-new-tests
Additional Notes:
- The GBU-57 is the most powerful non-nuclear bunker-busting bomb in the U.S. arsenal, with a penetration capability of up to 200 feet (61 meters) through earth or approximately 26 feet (8 meters) through 10,000 psi reinforced concrete, though exact figures are debated and may be classified.
https://en.wikipedia.org/wiki/GBU-57A/B_MOP - It has been upgraded multiple times (variants include GBU-57A/B through GBU-57F/B), with improvements to fuze systems, guidance, and penetration capabilities.
https://www.twz.com/our-best-look-yet-at-the-massive-ordnance-penetrator-bunker-buster-bomb - The bomb has not been used in combat but has been tested extensively, including drops from B-2 and B-52 bombers at White Sands Missile Range.
https://www.airandspaceforces.com/weapons-platforms/gbu-57-mop/ - Its size and weight limit its use to strategic bombers, with the B-2 being the only operational carrier as of 2025, capable of carrying two MOPs at a time.
The GBU-57 remains a critical part of the U.S. Air Force’s arsenal, maintained in limited numbers (estimated 20–50 units, though exact figures are classified). It has not been used in combat but is regularly tested and upgraded to counter advancements in enemy fortifications. Its strategic role is to provide a non-nuclear option for destroying high-value, fortified targets that are impervious to smaller munitions.
The need for a weapon like the GBU-57 emerged in the post-9/11 era, driven by the U.S. military's focus on countering hardened and deeply buried targets (HDBTs), particularly in countries like Iran and North Korea, where underground facilities were suspected of housing WMD programs. Existing bunker-busting munitions, such as the GBU-28, lacked sufficient penetration capability for modern, deeply buried targets.
Development (2004–2008): The U.S. Air Force, in collaboration with the Defense Threat Reduction Agency (DTRA), initiated the MOP program in the mid-2000s. Boeing was selected as the primary contractor to design a bomb capable of penetrating deeper and carrying a larger explosive payload than previous munitions. The GBU-57 was developed under a classified program, with initial contracts awarded around 2004.
Testing (2007–2011): The first successful test of the GBU-57 occurred in 2007 at the White Sands Missile Range, New Mexico, using a B-52 Stratofortress. Further tests confirmed its integration with the B-2 Spirit, the primary delivery platform, due to its stealth and payload capacity. By 2011, the bomb was deemed operational, with multiple test drops validating its penetration and guidance systems.
Upgrades (2012–Present): The GBU-57 has undergone several upgrades, resulting in variants like GBU-57A/B through GBU-57F/B. Improvements focused on enhancing the smart fuse (Large Penetrator Smart Fuze, LPSF), guidance accuracy, and penetration capabilities. A significant upgrade contract was awarded to Boeing in 2018 for further refinements, ensuring the bomb's effectiveness against evolving HDBT designs.
Strategic Context: The MOP was developed with potential adversaries like Iran and North Korea in mind, particularly their underground nuclear and missile facilities (e.g., Iran’s Fordow enrichment site). While never used in combat, its existence serves as a deterrent and a key component of U.S. strategic planning for preemptive or retaliatory strikes.