Oh, that's beautiful! If you find a link, please ping.
I believe it was on that very long Sunday Morning thread. The pertinent discussion already started before this post:
http://www.freerepublic.com/focus/f-news/1073827/posts?page=1462#1462 Comment on both Bush and Kerry's service record continues following it, and I think someone added up the service time for Bush, Kerry and Gore and came up with the remark I quoted.
Two things pointed out in the Dallas Morning News article were that Bush was the only National Guard officer pilot trainee in a class with regular officers from other branches of the service, and he applied for service in Southeast Asia but didn't have enough flying hours to qualify.