V as the central office for SS medical units. An SS medical academy was established in Berlin in 1938 to train Waffen-SS physicians. SS medical personnel did not often provide actual medical care; their primary responsibility was medicalized genocide. At Auschwitz, about three-quarters of new arrivals, including almost all children, women with small children, all the elderly, and all those who appeared on brief and superficial inspection by an SS doctor not to be completely fit were killed within hours of arrival. In their role as Desinfektoren (disinfectors), SS doctors also made selections among existing prisoners as to their fitness to work and supervised the murder of those deemed unfit. Inmates in deteriorating health were examined by SS doctors, who decided whether or not they would be able to recover in less than two weeks. Those too ill or injured to recover in that time frame were killed. At Auschwitz, the actual delivery of gas to the victims was always handled by the SS, on the order of the supervising SS doctor. Many of the SS doctors also conducted inhumane medical experiments on camp prisoners. The most infamous SS doctor, Josef Mengele, served as a medical officer at Auschwitz under the command of Eduard Wirths of the camp's medical corps. Mengele undertook selections even when he was not assigned to do so in the hope of finding subjects for his experiments. He was particularly interested in locating sets of twins. In contrast to most of the doctors, who viewed undertaking selections as one of their most stressful and horrible duties, Mengele undertook the task with a flamboyant air, often smiling or whistling a tune. After the war, many SS doctors were charged with war crimes for their inhumane medical experiments and for their role in gas chamber selections. Other SS units Ahnenerbe The Ahnenerbe (Ancestral Heritage Organization) was founded in 1935 by Himmler and became part of the SS in 1939. It was an umbrella agency for more than fifty organizations tasked with studying German racial identity and ancient Germanic traditions and language. The agency sponsored archaeological expeditions in Germany, Scandinavia, the Middle East, Tibet, and elsewhere to search for evidence of Aryan roots, influence, and superiority. Further planned expeditions were postponed indefinitely at the start of the war. SS-Frauenkorps The SS-Frauenkorps was an auxiliary reporting and clerical unit, which included the SS-Helferinnenkorps (Women Helper Corps), made up of female