How Do We Keep a Massive Plan Secret?

When the Allies were planning the Normandy invasion, mission commanders had to keep more than a million men from learning the location. At the time, and later, people speculated that the information was the best-kept secret on the planet.

With so many moving parts—such as ships, planes, men—involved in the Normandy Invasion, how would it be possible to keep the exact location of the landings a secret?

Why was it so important that the landing-locations were kept secret?

If the landing-locations had not been kept secret, what impact may that have had on the war itself?

Do you think that keeping the D-Day secret would be possible today? Why, or why not?

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