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. Heydrich was attacked in Prague on 27 May 1942 by a British-trained team of Czech and Slovak soldiers who had been sent by the Czechoslovak government-in-exile to assassinate him in Operation Anthropoid. He died from his injuries a week later. Himmler ran the RSHA personally until 30 January 1943, when Heydrich's positions were taken over by Ernst Kaltenbrunner. SS-Sonderkommandos Beginning in 1938 and throughout World War II, the SS enacted a procedure where offices and units of the SS could form smaller sub-units, known as SS-Sonderkommandos, to carry out special tasks, including large-scale murder operations. The use of SS-Sonderkommandos was widespread. According to former SS Sturmbannführer Wilhelm Höttl, not even the SS leadership knew how many SS-Sonderkommandos were constantly being formed, disbanded, and reformed for various tasks, especially on the Eastern Front. An SS-Sonderkommando unit led by SS-Sturmbannführer Herbert Lange murdered 1,201 psychiatric patients at the Tiegenhof psychiatric hospital in the Free City of Danzig, 1,100 patients in Owińska, 2,750 patients at Kościan, and 1,558 patients at Działdowo, as well as hundreds of Poles at Fort VII, where the mobile gas van and gassing bunker were developed. In 1941–42, SS-Sonderkommando Lange set up and managed the first extermination camp, at Chełmno, where 152,000 Jews were killed using gas vans. After the Battle of Stalingrad ended in February 1943, Himmler realized that Germany would likely lose the war, and ordered the formation of Sonderkommando 1005, a special task force under SS-Standartenführer Paul Blobel. The unit's assignment was to visit mass graves on the Eastern Front to exhume bodies and burn them in an attempt to cover up the genocide. The task remained unfinished at the end of the war, and many mass graves remain unmarked and unexcavated. The Eichmann Sonderkommando was a task force headed by Adolf Eichmann that arrived in Budapest on 19 March 1944, the same day that Axis forces invaded Hungary. Their task was to take a direct role in the deportation of Hungarian Jews to Auschwitz. The SS-Sonderkommandos enlisted the aid of antisemitic elements from the Hungarian gendarmerie