'Tis true. There's even been a $3500 reward out for anyone who saw GWB in uniform during the missing period. No one has tried to collect it.

Hardly an unbiased source (if the domain name didn't clue you in), but it has less biased links:
http://www.awolbush.com/

Also:
Washington Post
Boston Globe (They originally broke the story, I think.)
CNN
From the Straight Dope

There's also a prominant LA Times story that's out there, but it requires subscription to view and search their web site.


Someone's attempt to debunk the story   They don't have much of a case, but there's the other viewpoint anyway.