Military History/WW11 Normandy
E DeHaven wrote at 2008-03-17 07:27:04
I was told that it means "Day", to suggest "Day of Days". Even invasions of islands in the pacific were known as D-Day, so there wasn't a set single D-Day.
COLDJR wrote at 2014-02-12 23:41:12
"D" does stand for something. D, in military planning, is "Day", here, the day that an operation will begin. Similarly, H-Hour is the hour the operation commences, M-Month and so forth. Countdowns to D-Day, which should more accurately be written as D-0 or D+0 depending on your preference, would be D-(number) and countforwards would be D+(number); the first to show planning milestones leading up to D-0 and operational milestones following D-0.