Why the US used B-2 stealth bombers, costing $2.1 billion each to strike Iran's nuclear sites

President Donald Trump said Saturday that the U.S. military struck three sites in
Iran
, directly joining Israel 's effort to decapitate the country's nuclear program in a risky gambit to weaken a longtime foe amid Tehran's threat of reprisals that could spark a wider regional conflict.
The decision to directly involve the U.S. in the war comes after more than a week of strikes by Israel on Iran that aimed to systematically eradicate the country's air defenses and offensive missile capabilities, while damaging its nuclear enrichment facilities.
'We have completed our very successful attack on the three Nuclear sites in Iran, including Fordow, Natanz, and Esfahan," Trump said in a post on social media. "All planes are now outside of Iran air space. A full payload of BOMBS was dropped on the primary site, Fordow. All planes are safely on their way home.'
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US forces bomb Iranian nuclear sites; 'Fordow is gone' says Trump
Trump added in a later post that he would address the nation at 10 p.m. Eastern time, writing 'This is an HISTORIC MOMENT FOR THE UNITED STATES OF AMERICA, ISRAEL, AND THE WORLD. IRAN MUST NOW AGREE TO END THIS WAR. THANK YOU!'
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Trump said
B-2 stealth bombers
were used but did not specify what types of bombs were dropped. The White House and Pentagon did not immediately elaborate on the operation.
Why US used B-2 bombers?
B-2 bombers are the only plane capable of carrying the Massive Ordinance Penetrator, which experts have highlighted as the only type of bomb potentially capable of destroying Iran's underground Fordow nuclear facility.
ALSO READ:
In his own words: Trump's Iran strike tests his rhetoric on ending wars
What are B-2 bombers?
The U.S. B-2 costs about $2.1 billion each, making it the most expensive military aircraft ever built. Made by Northrop Grumman, the bomber, with its cutting-edge stealth technology, began its production run in the late 1980s but was curbed by the fall of the Soviet Union. Only 21 were made after the Pentagon's planned acquisition program was truncated.
The bomber's range of over 6,000 nautical miles (11,112 km) without refueling enables global strike capabilities from continental U.S. bases. With aerial refueling, the B-2 can reach virtually any target worldwide, as demonstrated in missions from Missouri to Afghanistan and Libya and now Iran.
Its payload capacity of more than 40,000 pounds (18,144 kg) allows the aircraft to carry a diverse array of conventional and nuclear weapons. The bomber's internal weapons bays are specifically designed to maintain stealth characteristics while accommodating large ordnance loads which could include two GBU-57A/B MOP (Massive Ordnance Penetrator), a 30,000-pound precision-guided "bunker buster" bomb.
Reports said six bunker buster bombs were used on Iran's Fordow research site.
The B-2's two-pilot crew configuration reduces personnel requirements while maintaining operational effectiveness through advanced automation systems.
The B-2's stealth technology incorporates radar-absorbing materials and angular design features that minimize detection by enemy air defense systems. Its radar cross-section is reportedly comparable to that of a small bird, making it nearly invisible to conventional radar.
Massive Ordnance Penetrator (MOP)
The 30,000-pound MOP represents the largest conventional bomb in the U.S. arsenal, specifically engineered to defeat hardened underground bunkers. Its massive size requires the B-2 to carry only one or two MOPs per mission, but provides unmatched bunker-penetration capability.
The weapon's 20.5-foot (6.25-m) length and GPS-guided precision targeting system enable accurate strikes against specific underground facilities. Its penetration capability of over 200 feet through hardened concrete makes it effective against the world's most protected underground installations.
Conventional Payloads
Joint Direct Attack Munitions (JDAM) provide the B-2 with precision conventional strike capability against fixed targets. These GPS-guided weapons can be deployed in large numbers, with the bomber capable of simultaneously engaging multiple targets with high accuracy.
Joint Standoff Weapons (JSOW) extend the aircraft's engagement range while maintaining stealth characteristics during approach. These glide bombs allow the B-2 to strike targets from outside heavily defended airspace perimeters.
Joint Air-to-Surface Standoff Missiles (JASSM) offer long-range precision strike capability with their own stealth features. The extended-range JASSM-ER variant provides strike options against targets over 500 miles (805 km) away.
Nuclear Payload capabilities
The B-2 Spirit serves as a key component of America's nuclear triad, capable of delivering strategic nuclear weapons with stealth and precision. The aircraft can carry up to 16 B83 nuclear bombs.

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