Is scary. An "ethical war?" No, the human element should never be taken out of war as it should be so terrible and evil that humanity tries to avoid it, not to let legions of robots into the battlefield.
Something they're not thinking about is, what happens when one of these bots get captured and reprogrammed and turned on us?
And this is the stupid shit that will doom us all. War isn't a video game, ethical or bloodless. If WW2 was fought with ethics, we'd still be fighting it today, or worse, conquered. The meaning of war is to impose your will on your enemy, to break thier backs and thier will to fight. There is no way to do this ethically.