Felix Steiner

A one time German SS Obergruppenführer (Basically a Lieutenant General or Major General) during the 2nd World War.
Became known for his role during the "Battle of Berlin" for refusing to obey Hitler's order to launch a suicidal charge against a much larger Soviet Force. When Hitler learned of this, suffered a complete nervous breakdown

Thanks to the 2004 film "Downfall" (Der Untergang)
his name has become a meme