Much as it surprises me, I have to halfway agree w/ Serenity here. (There's a first time for nearly everything, apparently.) Having a draft, one that young Georgie W or Darth Cheny types couldn't so easily duck out of would probably make the old white guys in DC less likely to unleash the dogs of war. It would certainly change the dynamic of opposition within the general population.
One of the biggest reasons we saw tens of thousands of young people (and others) protesting the police action in Vietnam (not a "Declared War" BTW) was that most young men at the time knew that they stood a fair chance of being sent over. 'Kinda riled up the parents of said young men too.
SSG Bales is a sad case. If he's guilty, it's a horrific crime, but I see him more as a tragic figure than a monster.