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I was reading the book "The Cold War At Sea" and something caught my eye.

It referred to the first deployment of the Polaris sea launched ballistic nuclear missiles.

It said that 10 years later, the U.S. discovered that fully 75% of the nuclear warheads aboard the Polaris missiles would NOT HAVE DETONATED!!!

How big a problem was this throughout the Cold War? Did the Soviets have similar problems with nuclear problems and at what point would these problems be solved?
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