http://en.wikipedia.org/wiki/Joseph_Cardinal_Ratzinger

"When Ratzinger turned 14 in 1941, he was required by law to join the Hitler Youth , but according to his biographer John Allen he was not an enthusiastic member. In 1943, at the age of 16 he was, along with the rest of his class, drafted into the Flak or anti-aircraft corps, responsible for the guarding of a BMW plant outside Munich.

He was then sent for basic infantry training and was posted to Hungary, where he worked setting up anti-tank defences until he deserted in April 1944 (an offence punishable by death). In 1945 he was briefly held in an Allied POW camp. By June he was released, and he and his brother (Georg) entered a Catholic seminary."