Lets be honest, the Germans were winning slowly on the eastern front at that time. Had D-day not occured, hence more time for the Germans, the Germans would have developed a prototype ICBM and ended the war. History profs. say that it was only a matter of time before the Germans developed such a weapon. In-fact, by the end of the war, the Germans were quite close to completing the ICBM project. That might be a nice mission, destroy the German V2 rockets before they blast off.