 Heydrich held the title of Chef des Sicherheitspolizei und SD (Chief of the Security Police and SD) until 27 September 1939, when he became chief of the newly established Reich Main Security Office (RSHA). From that point forward, the RSHA was in charge of SS security services. It had under its command the SD, Kripo, and Gestapo, as well as several offices to handle finance, administration, and supply. Heinrich Müller, who had been chief of operations for the Gestapo, was appointed Gestapo chief at this time. Arthur Nebe was chief of the Kripo, and the two branches of SD were commanded by a series of SS officers, including Otto Ohlendorf and Walter Schellenberg. The SD was considered an elite branch of the SS, and its members were better educated and typically more ambitious than those within the ranks of the Allgemeine SS. Members of the SD were specially trained in criminology, intelligence, and counter-intelligence. They also gained a reputation for ruthlessness and unwavering commitment to Nazi ideology.
