D - Day ( military term ) - wikipedia D - Day ( military term ) For the first day of the Invasion of Normandy, see Normandy landings. Battle plans for the Normandy Invasion, the most famous D - Day In the military, D - Day is the day on which a combat attack or operation is to be initiated. The best known D - Day is during World War II, on June 6, 1944 -- the day of the Normandy landings -- initiating the Western Allied effort to liberate mainland Europe from Nazi Germany. However, many other invasions and operations had a designated D - Day, both before and after that operation. 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. ( By extension, H + 75 minutes is used for H - Hour plus 1 hour and 15 minutes. ) Planning papers for large - scale operations are made up in detail long before specific dates are set. Thus, orders are issued for the various steps to be carried out on the D - Day or H - Hour minus or plus a certain number of days, hours, or minutes. At the appropriate time, a subsequent order is issued that states the actual day and times. Other days such as A-Day ( Battle of Leyte ), L - Day ( Battle of Okinawa ) etc. have different meanings for the military. Other languages have terms equivalent to D - Day such as `` Hari H '' ( Indonesian ), Час Ч ( Russian ), Dagen D ( Swedish ), Dan D ( Slovenian ), E eguna ( Basque ), Jour J ( French ), Lá L ( Irish ), Tag X ( German ), and Ziua - Z ( Romanian ). The initial D in D - Day has been given various meanings in the past, while more recently it has obtained the connotation of `` Day '' itself, thereby creating the phrase `` Day - Day '', or `` Day of Days ''. History Official U.S. Twelfth Army situation map for 2400 hours, 6 June 1944 The earliest use of these terms by the United States Army that the U.S. Army Center of Military History has been able to find was during World War I. In Field Order Number 9, First Army, American Expeditionary Forces, dated 7 September 1918 : `` The First Army will attack at H hour on D day with the object of forcing the evacuation of the St. Mihiel Salient. '' D - Day for the invasion of Normandy by the Allies was originally set for June 5, 1944, but bad weather and heavy seas caused U.S. Army General Dwight David Eisenhower to delay until June 6 and that date has been popularly referred to ever since by the short title `` D - Day ''. Because of the connotation with the invasion of Normandy, planners of later military operations sometimes avoided the term to prevent confusion. For example, Douglas MacArthur 's invasion of Leyte began on `` A-Day '', and the invasion of Okinawa began on `` L - Day ''. The Allies ' proposed invasions of Japan would have begun on `` X-Day '' ( on Kyūshū, scheduled for November 1945 ) and `` Y - Day '' ( on Honshū, scheduled for March 1946 ). References Jump up ^ Hakim, Joy ( 1995 ). A History of Us : War, Peace and all that Jazz. New York : Oxford University Press. ISBN 0 - 19 - 509514 - 6. Jump up ^ `` D - Day ''. The Oxford Companion to World War II. Oxford : Oxford University Press. 2005. p. 220. ISBN 0 - 19 - 280666 - 1. Jump up ^ `` What does the `` D '' signify in D - Day, and the `` H '' signify in H - Hour ? '' U.S. Army Center of Military History. Last updated 3 October 2003. Retrieved 5 June 2014. External links `` Digital Documents and Photograhs Project ''. Documents and Photographs regarding the D - Day Invasion, Dwight D. Eisenhower Presidential Library. Archived from the original on 2011 - 08 - 10. Retrieved 2009 - 11 - 15. U.S. Army official Normandy D - Day web site Coordinates : 49 ° 20 ′ 00 '' N 0 ° 34 ′ 00 '' W ﻿ / ﻿ 49.3333 ° N 0.5667 ° W ﻿ / 49.3333 ; - 0.5667 Retrieved from `` https://en.wikipedia.org/w/index.php?title=D-Day_(military_term)&oldid=797397787 '' Categories : Western European theatre of World War II Hidden categories : Wikipedia indefinitely semi-protected pages Wikipedia indefinitely move - protected pages All articles with unsourced statements Articles with unsourced statements from June 2009 Articles containing Slovene - language text Articles containing Basque - language text Articles containing French - language text Articles containing Irish - language text Articles containing Romanian - language text Coordinates not on Wikidata Talk View source About Wikipedia Català Čeština Dansk Deutsch Ελληνικά Español Esperanto Euskara فارسی Føroyskt Français Frysk Galego 한국어 Hrvatski Bahasa Indonesia Italiano Nederlands 日本 語 Norsk Norsk nynorsk Português Română Scots Shqip Simple English Slovenčina Srpskohrvatski / српскохрватски Suomi Svenska Türkçe Українська 中文 Edit links This page was last edited on 26 August 2017, at 20 : 24. About Wikipedia

Question: where did the term d day come from
Answer: Field Order Number 9, First Army, American Expeditionary Forces, dated 7 September 1918