[SunkenCiv]

Thanks Red Badger. Everyone has heard of *the* D-Day, Jun 6, 1944, but any large operation involving a large invasion force (amphibious, usually) had a D-Day, D plus ten, whatever. It's analogous to the countdown and countup duriing a rocket launch.

[dfwgator]

Lots of D-Days in the Pacific Theater during the War.

[Grimmy]

And on June 15 of that same year, the landing on Saipan.

Also on June 15, the Imperial Japanese Navy counter attack. The Battle of the Philippine Sea, aka The Great Marianas Turkey Shoot.