Page "Duck and Cover (film)" Paragraph 19

This signaled the beginning of the nuclear stage of the Cold War, and as a result, strategies for survival were thought out.

Fallout shelters, both private and public, were built, but the government still viewed it as necessary to explain to citizens both the danger of the atomic ( and later, hydrogen ) bombs, and to give them some sort of training so that they would be prepared to act in the event of a nuclear strike.