Then you don't know what a hero is.
If you are implying that Von Stauffenberg was try to end the Holocaust, then why did he not go after Goering or Himmler too?
Read up on the July plot. The other nazis were the responsibility of the plotters in Berlin and elsewhere. The Berlin portion of the operation was well underway, but fell apart when Hitler wasn't killed.
but I am a lot of it probably had to do with the treatment of the German 6th Army at Stalingrad and of course losing the war
More of a reaction to the landings in France than the situation in the East.
Oh please you have to come up with a better one than that.
Other heros? Hanna Reitsch. At the other end of the spectrum, the enlisted man who was ordered to murder a prisoner and who refused. (He was arrested, but released without punishment.) Since you limit it to military, we won't talk about the German women who staged a sit down strike in Berlin to free their husbands from Gestapo custody (they were successful).
Since you don't consider those who died fighting the Nazis to be heros, lets stick to those who proved their courage in more conventional ways. Skorzeny and Galland would make that list.