Northrop B-2 Spirit in the context of United States and nuclear weapons

Under the Manhattan Project, the United States was the first country to manufacture nuclear weapons and is the only country to have used them in combat, with the bombings of Hiroshima and Nagasaki in World War II against Japan. In total it conducted 1,054 nuclear tests, and tested many long-range nuclear weapons delivery systems.

The United States currently deploys 1,770 warheads, mostly under Strategic Command, to its nuclear triad: Ohio-class submarines with Trident II submarine-launched ballistic missiles, silo-based Minuteman III intercontinental ballistic missiles, and B-2 Spirit and B-52 Stratofortress bombers armed with B61 and B83 bombs and AGM-86B cruise missiles. The US maintains a limited anti-ballistic missile capability via the Ground-Based Interceptor and Aegis systems. The US plans to modernize its triad with the Columbia-class submarine, Sentinel ICBM, and B-21 Raider, from 2029.

Northrop Grumman Corporation, headquartered in West Falls Church, Virginia, is an American aerospace and defense company that designs and manufactures systems for aeronautics, defense, missions, and space. The company is the 5th largest contractor of the U.S. federal government; it receives over 2% of total spending by the federal government of the United States on contractors.

The company's Aeronautics Systems division (29% of 2024 revenues) develops the B-21 Raider strategic bomber that can drop conventional and thermonuclear weapons (forecasted to be ready for combat in 2029), the B-2 Spirit strategic bomber (which will be replaced by the B-21), fuselage and radar production for the Lockheed Martin F-35 Lightning II Joint Strike Fighter and F/A-18 Super Hornet, Grumman E-2 Hawkeye airborne early warning and control, MQ-4C Triton unmanned aerial vehicle, and the NATO Alliance Ground Surveillance Force. The company's defense systems division (19% of 2024 revenues) designs the modernization of the intercontinental ballistic missile system including the LGM-35 Sentinel, the Integrated Air and Missile Defense Battle Command System, Vinnell training, and the M1156 precision guidance kit. The company's mission systems division (25% of 2024 revenues) creates military radar, sensors, and related products, including C4I radar systems for air defense, Airspace Management radar systems such as AWACS, Multi-Platform Radar Technology Insertion Program, night vision goggles, Airport Movement Area Safety System, and battlefield surveillance systems like the Airborne Reconnaissance Low (ARL). Tactical aircraft sensors include the AN/APG-68 radar, the AN/APG-80 Active electronically scanned array radar, and the AN/APG-83 AESA radar upgrade for the F-16 Fighting Falcon, the AN/APG-77 AESA radar for the F-22 Raptor, and the AN/APG-81 AESA radar for the F-35 Lightning II, and the AN/AAQ-37 electro-optical Distributed Aperture System (DAS) for the F-35, and the APQ-164 Passive Electronically Scanned Array (PESA) radar for the B-1 Lancer. The company's space systems division (27% of 2024 revenues) develops Satcom communications satellites, Next-Generation Overhead Persistent Infrared satellites, the Cygnus uncrewed spacecraft, motors for the NASA Space Launch System, logistics support for the Lunar Gateway, Graphite-Epoxy Motor solid rocket boosters, and satellites for the Norwegian Space Agency.

The bombing of the Chinese embassy in Belgrade, also known in China as the May 8th incident, occurred May 7, 1999, during the NATO bombing of Yugoslavia, when a US B-2 Spirit dropped five Joint Direct Attack Munition satellite-guided bombs on the Embassy of China, Belgrade, FR Yugoslavia, killing three Chinese journalists and injuring twenty-seven others. According to the US, the intention had been to bomb the headquarters of Yugoslav weapons importer Yugoimport, 440 meters south on the same street. President Bill Clinton apologized for the bombing, claiming it was an accident.

Central Intelligence Agency director George Tenet later testified the bombing was the only one in the campaign organized by his agency, and that the CIA had "miscalculated" the Yugoimport coordinates from its address. The Yugoimport building was later bombed but remains standing as of 2019. The US claimed its own map and satellite imagery analysis approved the target while failing to identify it as an embassy. Although extensively referenced as a NATO mission and aircraft, all B-2 strikes were targeted and flown under United States European Command alone. One CIA officer was fired following an investigation.

The nuclear weapons of the United States comprise the second-largest arsenal in the world, behind Russia. The US is only country to have used nuclear weapons in warfare, in the atomic bombings of Hiroshima and Nagasaki at the end of World War II. The Manhattan Project, begun in 1942, made the US the first nuclear-armed country. The US operates a nuclear triad. The US previously possessed chemical and biological weapons. It is a ratifier of the nuclear Non-Proliferation Treaty, Biological Weapons Convention, and Chemical Weapons Convention.

As of 2025, the United States actively deploys approximately 1,770 warheads, mostly under Strategic Command, to its nuclear triad. Of these, 970 warheads on Trident II submarine-launched ballistic missiles aboard to Ohio-class submarines with, 400 warheads to silo-based Minuteman III intercontinental ballistic missiles, and 300 bombs and cruise missiles to B-2 Spirit and B-52 Stratofortress bombers. The US also forward deploys nuclear weapons in the form of approximately 100 B61 bombs in six European NATO countries: Belgium, Germany, Italy, the Netherlands, Turkey, and United Kingdom. The US warhead inventory totals 5,177 warheads, with 1,930 warheads for reserve use, and another 1,477 awaiting dismantlement.

On June 22, 2025, the United States Air Force and Navy attacked three nuclear facilities in Iran as part of the Iran–Israel war, under the code name Operation Midnight Hammer. The Fordow Uranium Enrichment Plant, the Natanz Nuclear Facility, and the Isfahan Nuclear Technology Center were targeted with fourteen GBU-57A/B MOP "bunker buster" bombs carried by B-2 Spirit stealth bombers, and Tomahawk missiles fired from a submarine. According to Trump, US F-35 and F-22 fighters also entered Iran's airspace to draw its surface-to-air missiles, but no launches were detected.

The attack was the United States' only offensive action in the Iran–Israel war, which began on June 13 with surprise Israeli strikes and ended with the ceasefire on June 24, 2025. It was the first U.S. attack on an Iranian target since the 2020 assassination of Qasem Soleimani, and on Iran's territory since a 1988 naval offensive.