On this day in 1954, the United States conducted the first in a series of nationwide civil defense tests known as Operation Alert.See <a href="https://omnystudio.com/listener">omnystudio.com/listener</a> for privacy information.

On this day in 1954, the United States conducted the first in a series of nationwide civil defense tests known as Operation Alert. See omnystudio.com/listener for privacy information.

On this day in 1954, the United States conducted the first in a series of nationwide civil defense tests known as Operation Alert.See <a href="https://omnystudio.com/listener" rel="noopener noreferrer">omnystudio.com/listener</a> for privacy information.

Americans take part in the first nationwide civil defense drill - June 14th, 1954

From the desk of “Stuff You Missed in History Class,” “This Day in History Class” quickly recounts a tidbit from today’s events in history.

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Americans take part in the first nationwide civil defense drill - June 14th, 1954

Americans take part in the first nationwide civil defense drill - June 14th, 1954