September 7, 1918
Operation Overlord was the code name for the Battle of Normandy, the Allied operation that launched the successful invasion of German-occupied western Europe during World War II.  The Normandy American Cemetery, overlooking Omaha Beach and the English Channel, was established on June 8, 1944, as the first U.S. cemetery in Europe during World War II. It holds the graves of more than 9,300 U.S. servicemen who died in the D-Day invasion or subsequent missions. Codenamed Operation Overlord, the battle began on June 6, 1944, also known as D-Day, when some 156,000 American, British and Canadian forces landed on five beaches along a 50-mile stretch of the heavily fortified coast of France’s Normandy region. The plan for Operation Overlord entailed landing nine divisions of sea and airborne troops, over 150,000 men, along a 60-mile stretch of coast in just 24 hours. On D-Day, three airborne divisions, one British and two American, would drop behind the landing beaches. D-Day was scheduled for June 5, 1944. But on the eve of the invasion, as the air and sea armada began to assemble, a storm arose in the English Channel. It threatened the success of the operation. It is dated September 7, 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 was set for June 5, 1944, but it actually occurred on June 6. Therefore, D-Day, as it applies to Overlord, is June 6, 1944. Source: The General Service Schools, Fort Leavenworth, Kansas, Combat Orders (Fort Leavenworth, Kansas: The General Service Schools Press. Phased orders are planned for execution on D-Day or H-Hour minus or plus a certain number of days, hours, or minutes. According to the U.S. Army's Center of Military History, the earliest known use of these terms is in Field Order Number 9, First Army, American Expeditionary Forces. The Normandy landings (codenamed Operation Neptune) were the landing operations on 6 June 1944 (termed D-Day) of the Allied invasion of Normandy in Operation Overlord during World War II.  D-Day was planned to begin with Paratroopers dropping into France by moonlight, the late evening or early morning before the invasion. Their goal was to take over the bridges and roads that the Germans to move the battlefields once the invasion began. The rest of the troops would land on 5 beaches. The eyes of the world are upon you.” - Dwight D. Eisenhower, supreme Allied Commander.. The History Channel. General Dwight D. Eisenhower Talking to Troops. General George Patton also made his famous D-day speech on June 5th, 1944. The Allied invasion of Normandy – American troops storm the beaches of Normandy, France, on June 6, 1944. D-Day was the largest seaborne invasion in history. More than 150,000 Allied troops -- about half of them Americans -- invaded Western Europe, overwhelming German forces in an operation that proved to be a turning point in World War II. REALITY: For many people, D-Day is defined by the bloodshed at Omaha -- the codename for one of the five beaches where Allied forces landed -- and the American airborne drops. The plan for Operation Overlord -- as D-Day was codenamed -- was largely that of Gen. Bernard Montgomery, the land force commander. The Royal Navy had overall responsibility for Operation Neptune, the naval plan. REALITY: For many people, D-Day is defined by the bloodshed at Omaha -- the codename for one of the five beaches where Allied forces landed -- and the American airborne drops. D-Day Plus 60 Years By Bruce L. Felknor When Dwight Eisenhower outlined his intentions for the Normandy Invasion, the list began: Land on the Normandy Coast. Build up the resources needed for decisive battles in the Normandy-Brittany region. 
https://en.wikipedia.org/wiki/Operation_Overlord http://www.history.com/topics/world-war-ii/d-day http://www.nationalww2museum.org/learn/education/for-students/ww2-history/d-day-june-6-1944.html https://www.dday.org/history/d-day-the-invasion/overview.html https://en.wikipedia.org/wiki/Normandy_landings https://www.mtholyoke.edu/~kmmurray/The%20Longest%20Day/planning%20operation%20overlord.html http://www.cnn.com/2014/06/05/opinion/opinion-d-day-myth-reality/index.html http://www.cnn.com/2014/06/05/opinion/opinion-d-day-myth-reality/index.html http://www.usmm.org/felknordday.html
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