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Long active in anti-proliferation efforts such as the Nuclear Threat Initiative, Nunn is leading a campaign to persuade U.S. and Russian leaders to take their thousands of strategic nuclear warheads off hair-trigger alert, a status that remains in effect more than a decade after the Cold War ended.
A hair trigger means missiles are launched - either from land or sea - upon the warning of an attack.
And missiles can be re-targeted in a matter of seconds: A couple of mouse clicks on a computer would put Washington, Miami or Moscow back in the nuclear crosshairs.
Nuclear weapons delivery is the technology and systems used to place a nuclear weapon at the position of detonation, on or near its intended target.
As opposed to conventional cruise missiles, which sometimes use cluster munition payloads, and as opposed to bombers, nuclearly armed cruise missiles have a single warhead.
Nuclear-armed cruise missiles are amongst the least deployed of all nuclear weapons, as their deployment is restricted by treaties such as SALT II.