details for the Final Solution to the Jewish Question. Department III was divided into the following sections: Section A (Law and Legal Structures) Section B (Race and Ethnic Matters) Section C (Cultural and Religious Matters) Section D (Industry and Commerce) Section E (High Society) Ausland-SD The Foreign Security Service (Ausland-SD), responsible for intelligence activities beyond the boundaries of Germany, was known earlier as Department III and later, after September 1939, as Department VI of the Reich Security Main Office. It was nominally commanded by Heydrich, but run by his chief of staff Heinz Jost. In March 1942 Jost was fired and replaced by Walter Schellenberg, a deputy of Heydrich. After the 20 July plot in 1944, Department VI took over the functions of the Military Intelligence Service (Abwehr). Department VI was divided into the following sections: Section A (Organization and Administration) Section B (Espionage in the West) Section C (Espionage in the Soviet Union and Japan) Section D (Espionage in the American sphere) Section E (Espionage in Eastern Europe) Section F (Technical Matters) Security forces The SD and the SiPo were the main sources of officers for the security forces in occupied territories. SD-SiPo led battalions were typically placed under the command of the SS and Police Leaders, reporting directly to the RSHA in Berlin. The SD also maintained a presence at all concentration camps and supplied personnel, on an as-needed basis, to such special action troops as the Einsatzgruppen. In fact, all members of the Einsatzgruppen wore the SD sleeve diamond on their uniforms. The SD-SiPo was the primary agency, in conjunction with the Ordnungspolizei, assigned to maintain order and security in the Nazi ghettos established by the Germans throughout occupied Eastern Europe. On 7 December 1941, the same day as the Japanese attack on Pearl Harbor, the first extermination camp was opened at Chelmno near Lodz by Ernst Damzog, the SD and SiPo commander in occupied Poznań (Posen). Damzog had personally selected the staff for the killing centre and later supervised the daily operation of the camp, which was under the command of Herbert Lange. Over a span of approximately 15 months, 150,000 people were killed there. Infiltration According to the book Piercing the Reich, the SD was infiltrated in 1944 by a former Russian national who was working for the Americans. The agent's parents had fled the Russian Revolution, and he had been raised in Berlin, and