Thinking about the anniversary of the Normandy landings, I was struck that the terms D-Day and H-hour were used to denote the start time of all allied military operations. Are there any specific reasons why the term has stuck to the particular operation of the Normandy landings?

  • Because it was DEE day. – Tyler Durden Jun 6 '14 at 18:53
  • It was the biggest operation of the war in the European front maybe... – American Luke Jun 8 '14 at 18:44
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    @AmericanLuke That claim needs to be qualified as "Western European front" or "amphibious operation". Else the Soviets would like a word with you. – Schwern Jun 9 '14 at 17:35

The Normandy landings were referred to as D-Day in the U.K. and U.S. press because on the day of the landings, and in the following weeks, the code name for the operation (Operation Overlord) was still secret. The press wanted to report that 'the attack' on the Axis powers had started, and used the standard term D-Day as there were no restrictions on the use of this term. As it was used at the time in the press, the term has stuck. For example, the newspaper front page: http://www.archives.com/genealogy/newspapers-d-day.html has the headline "D-Day Chronology" near bottom.

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The D merely stands for Day; in French, it's referred to as "Jour J". The term is indeed used for other D-Days, just not in regular English conversation.

Quoting from "D-Day" on Wikipedia:

The terms D-Day and H-Hour are used for the day and hour on which a combat attack or operation is to be initiated. They designate the day and hour of the operation when the day and hour have not yet been determined, or where secrecy is essential. For a given operation, the same D-Day and H-Hour apply for all units participating in it. When used in combination with numbers, and plus or minus signs, these terms indicate the point of time preceding or following a specific action. Thus, H−3 means 3 hours before H-Hour, and D+3 means 3 days after D-Day.

The article continues, to mention that several other lanugages use the initial letter in a similar fashion:

  • Hari H (Indonesian)
  • Час Ч (Chas Ch, Russian)
  • Dagen D (Swedish)
  • Dan D (Slovenian)
  • E eguna (Basque)
  • Jour J (French)
  • Lá L (Irish)
  • Tag X (German, an exception)
  • Ziua-Z (Romanian)

The article also links to "Military designation of days and hours", which has examples of other terms, just as F-Hour or O-Day.

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It was the largest and most important in that war, so the general term attached itself to the specific day.

This kind of thing happens all the time, like all tissues being called Kleenex or all bleaches Chlorox.

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    What's Chlorox? I'll just get my Biro ... – andy256 Jun 8 '14 at 9:23

D-Day was a watershed (though not necessarily decisive) event in World War II. It represented the counterinvasion of France, and a springboard for the a strike at the German heartland, thereby undoing Germany's "rise" in the 1940 Battle of France.

World War II is widely regarded as the greatest war in human history, not only compared to wars before, but to wars afterward. Certainly, everyone hopes that the scope and scale of World War II will never be exceeded.

In this context, D-Day means "THE Day" of THE greatest war in human history.

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    In the western point of view, anyway. In the grand scheme of things D-Day only ensured that the USSR would not dominate central Europe as well and ended the war maybe a year or 2 earlier. I find it abit odd that D-Day is commemorated but not Bagration, which occured 20 days later but netted about 3 times the casualties. – Evil Washing Machine Jun 9 '14 at 15:44

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