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.  

Military History

All Answers

Answers by Expert:

Ask Experts


Jim Saurman


I can usually handle any question on USA or European history since 1870. I am especially interested in WW2 and Spanish-American War. Also Spanish Civil War and WW1 to a lesser extent.


B.A. in History.

©2016 All rights reserved.