this, an excerpt from S.L.A. Marshall's "First Wave at Omaha Beach" in the November 1960 edition of The Atlantic (subscription/registration required). It's horrifying, heartbreaking and your duty as a citizen of the world.
Then check out this site, a collection of D-Day memories by the BBC. An excellent source of first-person stuff.
And take a look at this Civil Defense manual from WWII, posted by Lileks. Soldiers weren't the only ones who gave to the war effort.
Finally, take a look at what our current crop of heroes is doing in their spare time. They're right, their voices are the only ones not being heard on the War on Terrorism. And that's a terrible thing.