This is from the end of the 12th part of
Alistair Cooke's America. It covers the procedures followed at the time by Strategic Air Command both above and below ground in some impressive detail. I'd like to see what the modern equivalent to this is as closely but something tells me it's far too 'top secret' now. Surely these days they have gates that can open automatically... and do the guys in the missile silos still strap on guns every shift so they can shoot their buddies if they suddenly go mad? What if the mad one shoots the others first?