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About an hour in to the mission I discovered that Nazis are actually kinda dumb and you don't really have to be very careful at medium difficulty.
Also, i don't understand why there are non-lethal options in this game, but I suspect there may be liberalism afoot.
I should note - If I did knock a Nazi out I specifically went back and shot them in the head. Those ten guys were accidents. Would have gotten them if I could.
If your mission is to take out a specific high level target then there could be good reason to take a non lethal approach to a mission. That said, a non lethal approach to Nazis is ridiculous, kill them all with no quarter given.