This, if it even happened, wouldn't really change the point. There was far too much evidence that the holocaust was happening for people not to know, and indeed, it was generally held as an open secret.
In terms of the army, I'd guess it varies. If they were on the Eastern Front or directly involved in it, then you're quite correct to state that ignorance would be near impossible. If they were just sitting on some part of the Atlantic Wall for 4 years then I'd imagine one wouldn't see much more than a normal civilian.
In terms of the camps themselves, there's substantial evidence that it was known about. Or at least, that it was known that the Jews were being killed (specifics aside). One of the common things that came up in German civilian discussions of the bombing was that the Allies were doing it as revenge for what the Germans were doing to the Jews; in other words, that the Jewish powers were actively engaged in a war of extermination with Germany and that both were quite literally trying to wipe each other out.