fission bombs, fusion bombs, in the late 1950s "clean fusion" bombs.
aerial bombs, artillery shells, missile warheads, you name it they did it. (the DOD did want nuclear hand grenades and mortar shells, but the labs didn't quite get them that small.)
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Announced US Policy, diected at the Soviet Union, that declared that the US could or would respond with the maximum number of nuclear weapons, if the United States (or key allies) was attacked with one or more nuclear weapons from the Soviet Union or any of its allies. It was designed to deter the Soviets from the use of nuclear weapons.
nuclear deterrence - the idea that if you attack me with nuclear weapons then I will attack you back with nuclear weaponsmutual assured destruction - the idea that if you attack me with nuclear weapons then I will totally destroy you with nuclear weapons and if I attack you with nuclear weapons then you will totally destroy me with nuclear weapons - thus any nuclear attack by either party will result in the certain destruction of both parties
fifth rank in nuclear weapons
Egypt is not believed or suspected to have nuclear weapons, or a nuclear weapons program, at this time (May 2009). See Related Link for a discussion of the world's nuclear powers.
There were no nuclear weapons in WW1. The nuclear bomb was not invented until WW2.