Chris links to a Huffington Post article about Larry Craig throwing up road blocks to updating the GI Bill. Julie has the link as well.
Soldiers have, at least since the 80s when I became an officer, tended to be conservative and Republican. Part of that is just a function of Idaho demographics; Idahoans are in the Guard, Idahons lean conservative, the Guard Idaho is populated by conservatives. I've rubbed shoulders plenty with soldiers from elsewhere, and can confidently say that, yep, a pretty conservative crowd. They're not going to flip and become Democrats, but they might just not vote for a someone like Craig (he'll be gone) who works against such a personal interest.
I'm going to ask around of my Guard buddies what they think of Craig opposing the update to the GI Bill.