D-Day, in military actions means the focus point of the exspected time of the action. It is easier to say 16 days before d-day or 5 days after d-day, for the planning part of the operation. Such as : we need 2,000 troops here at -2 d day, ect. The actual operation was called 'Overloard', we lost over 4,400 troops on that 6th day of June , 1944.
Interesting question, Kathy. Thanks. I'd heard the usage (D day, H hour), but I'd never stopped to think about it. I guess the correct usage would be "D Day, re-invasion of Europe" or some such. Good basic planning tool, particularly without computers, as you don't have to re-draw the plan when the date changes.
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