FWIW, one of the best BS sales victories of the commies was that “Duck and Cover” was an absurdity.
Depending on distance, there is a significant and useable matter of seconds from the flash of a nuclear detonation and the blast/shock wave that blows out windows and propels objects about. “Ducking and Covering” greatly reduces the number of injured produced by flying debris, particularly glass. This was actually demonstrated in Japan by a Hiroshima survivor conveying this to people, mainly fellow employees, when he went to resume work at a facility in Nagasaki.
Interesting.