So this is where is all begins, the President (usually a sane individual) gives the order to launch.
He needs a second man, known as the “two-man rule” it generally goes to the Secretary of Defense, but any Cabinet member will suffice.
We can hope for a mutiny, but it would be unprecedented and unlikely.
Less than three minutes have elapsed.
The codes are matched and the order is confirmed.
Maybe five minutes.
Five to six minutes later we have launched nuclear weapons.
We can expect hundreds of thousands of casualties on the Korean Pennisula, if North Korea can strike the US, it’s GAME OVER.