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first today intelligence var role these used officers hour has common was come but momentous because june launched ultra seldom landings minute day operation war world denote history shorthand expression also stakes parlance

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🌍 History Today, June 6: The role of signals intelligence or 'ULTRA' on D-Day (NSA News)

[3/4/2026] : 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

🌍 History Today, June 6: The role of signals intelligence or 'ULTRA' on D-Day (NSA News)

[1/10/2026] : 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