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

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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