The first expedition of MacKneal´s team to the Castle map was baptized Operation Tannhäuser by the leading tactician. It is in the old rulebook, I think.
I think the name just sounded "german" to the french developers, and thus "exotic". I think everyone already knows, but Tannhäuser is the name of an opera by Wagner. Just in the case that there are still people out there who does not know already...