My father was in the Corps of Engineers.We lived in a little town between Frankfurt and Weisbaden. When we went to Berlin on vacation, he couldn't go to East Berlin.This was just prior to the Berlin Wall going up. I remember my mother telling us he could not come to East Berlin with us because they might take him and keep him. He would often go off to Lebanon (l956-l959),I don't know what was going on in the Middle East at that time. Based on what you've said, I guess there's no point in pursuing the "top secret" route. Thanks for yourhelp.