FILE - In this Nov. 21, 1951 file photo, sixth grade students crouch under or beside their desks along with their teacher, Vincent M. Bohan, left, as they act out a scene from the Federal Civil Defense administration film "Duck and Cover" at Public School 152 in the Queens borough of New York. For some baby boomers, North Korea's nuclear advances and the Trump administration's bellicose response have prompted flashbacks to a time when they were young, and when they prayed each night that they might awaken the next morning. For their children, the North Korean crisis was a taste of what the Cold War was like. (AP Photo/Dan Grossi, File)

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