"You are about to embark upon the great crusade toward which we have striven these many months. The eyes of the world are upon you," Gen. Dwight D. Eisenhower said to the troops before heading off to Normandy beach for what is known as the D-Day invasion. "I have full confidence in your courage, devotion to duty and skill in battle."

June 6, 1944, marked the first day of the the Normandy landings, code named Operation Neptune, where the allies invaded Normandy Beach in Operation Overlord during World War II. While this day will forever be marked in history, there are a few facts that go unnoticed.

1. The D in D-Day has no special meaning. According to PBS , The U.S. Army began using the codes "H-hour" and "D-day" during World War I to indicate the time or date of an operation's start.

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