In the United States, at least, ballistic missile submarines that never receive an authenticated launch order will not launch their missiles. It's meant to be t

In the United States, at least, ballistic missile submarines that never receive an authenticated launch order will not launch their missiles. It's meant to be technologically impossible. Perhaps someone with more knowledge knows if it's possible to give an authenticated order along the lines of "if you don't hear back from us in an hour, launch all your missiles." I've never heard of such a thing but there are at least two former submariners here on hn, so...