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In the 1980s at their peak the US had over 20,000 nuclear weapons and the USSR had over 35,000.
If a full out nuclear exchange took place in the 1980s how many of those weapons (ICBMs, SLBMs, torpedoes, bombs, artillery, cruise missiles etc) would actually be delivered to their targets?
How many nuclear weapons on each side would go unused due to the lack of sufficient means to deploy them successfully?