It turns out that training soldiers isn't very helpful unless you're sure the trained soldiers aren't going to turn around and shoot at you once the training's done:
But now on his third deployment in Iraq, he is no longer a believer in the mission. The pivotal moment came, he says, this past February when soldiers killed a man setting a roadside bomb. When they searched the bomber’s body, they found identification showing him to be a sergeant in the Iraqi Army.
Of course the media refuses to report the good news -- many of the people we're training don't attack us!