The expedition had German liaison officers; the most prominent of them being Himmler's communications officer, SS-Obersturmbannführer Karl Rennau, while Franz Göring was a liaison officer with the Gestapo. The expedition had around 40 German communication, SS and Gestapo officers. The Germans demanded that every second vehicle should have a German officer on board. The "White Buses" expedition was totally dependent on cooperation with the Germans as the country under Nazi rule was a police state. Only with liaison personnel from the Gestapo and SS could the expedition move without restrictions.
