You can't have a two man rule because two men can tie. [...] The guiding principle behind nuclear weapons as a deterrent is the fact that our enemies MUST believe that we can and will use nuclear weapons.
The US has had the two-man rule for a while -- for much of the Cold WAR, afaik.
I don't believe the Soviets were ever in any doubt that the US was ready to use nuclear weapons if circumstances justified doing so.
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