Dear Joachim, I belong to the German Genealogical Group and we have interesting lectures at our monthly meetings. We also receive a monthly newsletter! One piece of information that we were told is that if you are looking for military information, you have to look for it at the location where the person mustered out of the service. I do not know how you find out where they were when they left the military, but that is where you have to search! Good luck to you! Ghyll