People in the United States had to practice going in and out of bomb shelters and learned how to protect themselves out on the streets if the siren went of and there wasn't a shelter nearby
For the average American it meant building bomb shelters, hearing air raid horns being tested, sonic booms, and children practicing in schools what to do in case of a nuclear attack. Fueling the fear was the Soviet Union and the United States each developing an atomic bomb larger than the other side.
