School children were taught in the early 1950's that the first line of defense against a nuke attack was to crawl under a desk and put your head between your legs. Kiss your butt goodbye was added by parents.
I remember that from the 1960's as well. Remember though that we were talking about mutually assured destruction back in those days, but today we face the possibilty of one or several devices going off in this country without it triggering an all out nuclear war between super powers.