I believe he has been honored before. I seem to remember last year including the last three or possibly 4 WWI veterans.
Well, he has been honored several times over the past few years. Here’s a link to his page on the Library of Congress Veterans History Project.
http://lcweb2.loc.gov/diglib/vhp-stories/loc.natlib.afc2001001.01070/#vhp:clip
He was also just recently given special permission to be buried at Arlington National Cemetery.
http://www.salem-news.com/articles/april082008/ww1_vet_4-8-08.php
Bush had him in the Oval Office in March.
There is a photo of it somewhere.