We had lots of air raid drills because we were very close to the Watertown (MA) Arsenal,which operated 24 hours a day.It’s windows had all been painted black.
I still remember the warden for our street making sure no light shone through when the sirens were blaring.
Almost seems like yesterday.
.
We lived in a small town in Texas...not close to the coast. but I saw blacked out windows on a war supply factory on the very rare trips to see my elderly grandparents. Gas rationing kept us healthy walking or biking.