Waldheim published an autobiography. During his campaign to become president in 1986, it became public that some statements in that biography were not true. These were about his past. Waldheim was an officer for Germany in the Second World War. He became an oberleutnant in the Wehrmacht. Waldheim participated in Operation Kozara in 1942. According to one post-war investigator, prisoners were often shot within only a few hundred meters of Waldheim's office and away at the Jasenovac concentration camp. Waldheim later said, "he did not know about the murder of civilians there".