My son just returned from a one year tour of duty in Baghdad. I communicated with him a lot there and now. His take is very different from yours. He says most of the troops are behind the mission, see what they are doing as important, see the progress, and are proud to have accomplished so much.
There is a concerted effort on the part of the Dems to recruit the minority and make it into a propaganda piece for their cause. This is the reason you are hearing that viewpoint in my opinion, and it is simply not the common viewpoint of the common soldier.
I have no doubt the dems are using this to their advantage, which is disgusting. But whether we like it or not there is a growing concern over the situation over there. We don't doubt the mission or the works we've done, but we do question where it will go...especially when we aren't there to watch over them.