Which of these Secretaries General of the United Nations served in the German Nazi Army during World War II?

From the list of men who served as Secretaries General of the United Nations, the one who served in the German Nazi Army during World War II was Kurt Waldheim. Although it was never proved that Waldheim committed atrocities during World War II, he was a lieutenant in army intelligence, attached to brutal German military units that executed thousands of Yugoslav partisans in death camps from 1942 to 1944. Waldheim lied about his wartime service in the Balkans. He maintained that his military career ended in 1942 after he was wounded on the Russian front.

Many years after the war Waldheim launched a discreet but effective campaign to become UN Secretary-General. Despite initial vetoes from China and the United Kingdom, in the third round, Waldheim was selected to become the 4th Secretary-General of the United Nations in January 1972. In 1976, China initially blocked Waldheim's re-election, but it relented on the 2nd ballot.

In 1981, Waldheim's re-election for a 3rd term was blocked by China, which vetoed his selection through 15 rounds. So, from 1986 to 1992, Waldheim served as President of Austria, making him the first head of state to rise to the position after having been Secretary-General of the United Nations. In 1985, it was revealed that a post–World War II UN War Crimes Commission had labeled Waldheim as a suspected war criminal, based on his involvement with the army of Nazi Germany. There are Commission files on record that have been stored in the UN archive.