Going to grade and high school (60s and 70s again) our small town was supposed to use the Glen Canyon wall tunnel (that they made while building the Lake Powell dam) as a shelter if nuclear war came.
Even as teenagers we could see how nuts that was. The dam at the time was a major source of electricity for the SW -- almost certainly a target. And you expect us to be inside the canyon wall when the dam is destroyed and the lake drains down the river canyon?
I don't think there was anyone in the area that stupid -- but I have no idea what we would have done.
Additional
I did have a friend (a little bit later) who was a Mormon missionary in Russia. When he returned he said he never wanted to eat cabbage again in his life. Ha, ha.
The lives he saw weren't completely destitute -- but they certainly weren't filled with roses either.