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 Main Security Office.[89] It was nominally commanded by Heydrich, but run by his chief of staff Heinz Jost.[90] On March 1942 Jost was fired and replaced by Walter Schellenberg, a deputy of Heydrich.