A selection of US nuclear weapons.

From right to left: Flashback, the US' answer to the Soviet Union's Tsar Bomba, this would have had a yield of over 100 megatons. It never went beyond an aerodynamic model used for testing B-52 stowage, because the US and USSR negotiated the first of a series of nuclear treaties.

B53, a 9-megaton freefall bomb, meant to destroy heavily hardened targets such as nuclear control centres. Carried by the B-47, B-52, and B-58. Retired in the Nineties, and finally disassembled in 2010.

B83, a 1.2 megaton freefall bomb, carried by the B-52 and B-1B, presently being retired.

B61-12, a variable-yield bomb from 30 tons to 50 kilotons. Presently in service. The next version, the B61-13, will have a yield of up to 300 kilotons.

W78, 340-kiloton MIRV warhead for the Minuteman ICBM, which may have up to three. In service.

W76, made in two versions for the Trident SLBM, which can carry up to 14: the W76-1, a 90-kiloton version; and the W76-2, an 8-kiloton version. In service.

W80, 150- or 5-kiloton switchable-yield warhead for the Air-Launched Cruise Missile. In service.

W82, a 6-inch, 2-kiloton nuclear artillery shell for the 155mm howitzer. Never produced, program was cancelled with the end of the Cold War.

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B61

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