How the moon played a crucial role during the D-Day invasion

Photos: The Allied invasion of Normandy
American troops storm the beaches of Normandy, France, on June 6, 1944.
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Photos: The Allied invasion of Normandy
The British Army's 50th Infantry Division lands on beaches in Normandy.
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Photos: The Allied invasion of Normandy
Four Americans show off their shaved heads, which spell out the word "hell," a few hours before arriving on the beaches of France.