"During the 1950s and 1960s, New York City police would conduct compulsory air raid drills, also known as "duck and cover" drills, where people would take shelter when sirens sounded. The drills were a civil defense response to the possibility of a nuclear attack during the Cold War between the United States and the Soviet Union."
I lived on Shore Parkway in Brooklyn when I was three years old. I can still remember walking with my mother on 20th Avenue when that siren sounded and we stood against a wall until there was silence. That wall is still there today.