You are aware that France -- our ally -- was actually occupied by an enemy power? Or were you not aware of that?
You are aware that German soldiers were uniformed combatants, who therefore under the US code could not qualify as US citizens, even if they had once been; I'll venture a guess that you were not actually aware of that fact, because you also seem to be unaware that...
... the President of the United States did not order US air strikes to kill particular Germans in France from a list.
You also seem to be unaware that you still haven't posted a serious reply. Here's a clue your content-free post doesn't entitle you to, but I'm a charitable person: Impugning someone's capacity may be considered a serious response among gamers, but it generally isn't on FR.
Now, do as you were instructed, and come back when you actually have a point to make.
Look, you posted "He was killed in a country we are not at war with, so the President's war making power has dubious applicability", implying that the presidents war making power does not apply to killing an enemy if he is "in a country we are not at war with". I posted "So I guess it was wrong for us to kill Germans in France?" where we killed enemies "in a country we are not at war with". See, it's simple. Either the Presidents war making power does extend to enemies "in a country we are not at war with" in which case attacking Germans in France was OK, or, as you stated, the presidents war making power does not extend to killing enemies "in a country we are not at war with", in which case it was not OK for us to kill Germans in France.
That is logic. You then went into a tirade about your father, FDR and other things that were not part of your statement about the presidents war making powers in a country we are not at war with.
That is not logic.