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signals denote refer seldom scope expression common today also earlier shorthand because operation intelligence landings hour world role first was stakes come primarily parlance ultra launched minute war june momentous used day were

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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