Why is the Normandy invasion called D-Day?

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Answer

"D-day" is a military term originating in the First World War which references "the unnamed day on which an operation or offensive is to be launched."

Entry for D-day (Dictionary.com)

http://www.dictionary.com/search?q=D-day

D-Day is also known as the "debarkation day" (June 6, 1944) of the Normandy Invasion (Operation Overlord) of WWII. Just as D-day references the commencement of a particular operation, "H-hour" will reference the exact time that such an operation would start. Other similar terms are described in these links below.

FAQ: What does the D in D-Day stand for? (Imperial War Museum Collections)

http://www.iwm.org.uk/collections/books/bookfaqs7.htm

D-day (Grolier Online)

http://gi.grolier.com/wwii/wwii_dday.html

Additional Resources - Normandy Invasion

Normandy: 1944 (Britannica Online)

http://normandy.eb.com/

D-Day, the Normandy Invasion, 6 - 25 June 1944 (Naval Historical Center)

http://www.history.navy.mil/faqs/faq109-1.htm

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"Normandy Invasion" d-day military term d-day

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Normandy campaign (historical event, United States/France)
D-day (day)

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