They were still doing duck and cover disaster drills when I was in elementary school. For a while after they were no longer required for nuclear attack, we kept doing them for earthquake response since it was in San Diego. My Elementary school was built like a fortress, half dug into the side of a hill. The windows were floor to ceiling but only about 4 inches wide with thick decorative reinforcing bars between the panes. The walls were about a foot and a half thick reinforced concrete. Somehow they managed to make it look attractive, with interesting landscaping outside and good lighting and interior design inside. It's one heck of a strong building, not a bad place to ride out an earthquake or nuclear attack. In that bldg., hiding under a desk would actually be a pretty decent option since the major interior damage, assuming the building survived, would be ceiling tiles and stuff falling. Hiding under a desk is a great way to keep a kid from getting killed by a falling ceiling light fixture or air conditioning vent.
And knowing what I know about CBRNE / NBC warfare, the suggestion to have a bunch of plastic sheeting and duct tape to seal off doors and windows in the event of an NBC attack is actually pretty smart. It's too bad idiots who think they know everything about everything were so caustic and sarcastic, spending a lot of time trying to discredit what is in fact a really good defensive measure against many NBC attacks. Sealing off your house for 48 hrs would be effective against probably 90% of the common agents and delivery methods, not a bad way to improve your odds of being a survivor of such an attack.