Others have already said it: Conscientious Objector status is for draftees, not volunteers. A true C.O. wouldn't volunteer in the first place.
It's outrageous that somebody would volunteer for military pay, benefits, and training, then pretend he didn't know what he was getting into.
Like Benedict Arnold he changed his mind and crossed over to the enemy. He said there was no just war and called for dismantling the US mil in one "peace" rally. However, that was a rare utterance. Most of his rubbish claims the US is engaged in an illegal war and that the jihadi's are peaceful folk being grievously and illegally offended by America.