The issue is Walter Reed.
Ironically, the VA system--no relation to the DoD operators of Walter Reed, if you know what you're talking about--is currently being lauded by advocates of national health care as a shining example of how well government health care can work.
Note the link to an article on a VA hospital on the same page as your link.
Democrats who don't know jack about the military--way too many of them--are going to be trying to make political hay out of something they're already getting wrong.