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U.S. Soldiers disembark a landing craft under heavy fire off the coast of Normandy, France, June 6, 1944. (Photo Credit: National Archives U.S. Coast Guard Collection)

June 6, 2024

History Today, June 6: The role of signals intelligence or 'ULTRA' on D-Day

The term D-Day was a shorthand expression first used in World War I to denote the date an operation was to be launched. In the earlier war, officers also used H-HOUR and M-MINUTE, but these were seldom used in World War II. Because of the scope of the 1944 operation and the momentous stakes, in common parlance, “D-Day” has come to refer primarily to the landings in Normandy.