since I hadn't revisted this issue in years, I did a quick and dirty survey. the Nazi missiles were the A9 and A10 - sorry for the error. here is a link to a brief and incomplete treatment of Axis plans upon the US;
http://en.wikipedia.org/wiki/Axis_plans_for_invasion_of_the_United_States_durin g_WWII
thanks for triggering memories of past studies...