Diz a wikipedia:
Following his fourteenth birthday in 1941, Ratzinger joined the Hitler Youth as membership was legally required after December 1936.[2] According to one of Ratzinger's biographers, the National Catholic Reporter correspondent John Allen, he was an unenthusiastic member who refused to attend meetings. His father was a bitter enemy of Nazism, because he believed it was in conflict with their faith. In 1941 one of Ratzinger's cousins with Down's Syndrome was murdered by the Nazi regime. In 1943, when he was 16, Ratzinger was drafted with many of his classmates into the Luftwaffenhelfer (Air Force Auxiliary) programme. After his class was released from the Corps in September 1944, Ratzinger was put to work setting up anti-tank defences in the Hungarian border area of Austria in preparation for the expected Red Army offensive. He was eventually drafted into the German army at Munich to receive basic infantry training in the nearby town of Traunstein. His unit served at various posts around the city and was never sent to the front. Ratzinger was briefly interned in an Allied prisoner-of-war camp near Ulm and was repatriated on June 19, 1945. The family was reunited when his brother, Georg, returned after being repatriated from a prisoner-of-war camp in Italy.
Following repatriation in 1945, the two brothers entered Saint Michael Seminary in Traunstein, and then studied at the Ducal Georgianum (Herzogliches Georgianum) of the Ludwig-Maximilian University in Munich. They were both ordained on June 29, 1951 by Michael Cardinal von Faulhaber of Munich. Joseph Ratzinger's dissertation (1953) was on Augustine, entitled "The People and the House of God in Augustine's Doctrine of the Church". His Habilitationsschrift (which qualified him for a professorship) was on Bonaventure. It was completed in 1957 and he became a professor of Freising College in 1958.
Discutam.