Elementary school had duck n cover drills.
The teacher pulled the heavy curtain or drape (made of rubber) over the windows. Lights out. And we were under (duck) our desks with one hand over the back of our neck, the other hand covering forehead or eyes. Can't remember exactly.
It was fun, but it was a bit chilling. Elementary age. And the siren sounded deathly. Gray. Empty. We had to be quite. It was for possible earthquakes or air raids. Or nuclear missile strike. We would have been dead for sure if it the last ever happened.