Lots if not all Elite units can't by their very nature take POWs. Commando raids, paratroopers and the like. Easy to have judgement of the likes of Roland Speirs in Band of Brothers when he offered a last cigarette and then mowed them all down. What do you think their briefing was on the 5th of June 1944? How do you feed and provide care 100 km behind the lines? Natural when you deal out Victor's Justice you need the Geneva and the, The Hague codes. The worst crime during a war is to wage war against your own people. So no excuse for the holocaust even an anti-Semite like the German Kaiser had not much time for Hitler.