Bush's Guard Duty

I don't have a strong opinion (and don't much care) about exactly how many months George W. Bush served in the National Guard, but his response to Tim Russert's question regarding the president's military records (quoted in yesterday's New York Times) strikes me as odd. After saying he'd be happy to release the records, Bush added:

And I'm just telling you, I did my duty, and it's politics, you know, to kind of ascribe all kinds of motives to me. But I have been through it before. I'm used to it.

Isn't the issue Bush's actions (or nonactions), as opposed to his motives? It's not as if the Democrats are saying, "Yeah, he fulfilled all of the Guard's requirements, but he didn't have the right attitude."