On 8 February 1940, Aantjes began working for the postal mail company PTT.[1] On 19 July 1943, he was selected for Arbeitseinsatz and sent to Güstrow in Germany to deliver mail. Aantjes later explained that he had not refused selection because if he had, the board of PTT would have sent a married employee in his place. In September 1944, Aantjes wanted to return to the Netherlands. Other Dutch forced laborers told him that if he joined the Germanic SS, he could ask for an assignment in the Netherlands and be trained as a police officer on the Avegoor estate near Ellecom.[2] Aantjes decided he would follow this route, and enlisted in the Germanic SS.[3] To his dismay, he was assigned to Landstorm Nederland, a division of the Waffen-SS and he received a uniform. After being transferred to Hoogeveen, Aantjes refused to wear the uniform and to enlist in Landstorm Nederland. He was arrested and imprisoned in Port Natal near Assen, an abandoned psychiatric hospital that had been turned into a work camp by the Nazis.
After the war ended in May 1945, Aantjes enrolled at the University of Utrecht to study law. He never mentioned his enlistment in the Germanic SS to anyone.
In 1978, Loe de Jong of the Dutch Institute for War Documentation was confronted with stories about Aantjes's alleged sympathies for Nazism. Although the Institute usually did not respond to such rumors, De Jong – considering the high position of Aantjes – believed that further investigation was necessary. His staff discovered a note, which showed that Aantjes was mobilized in October 1944 as part of the Waffen-SS.[7] On 6 November 1978, De Jong announced in a press conference that Aantjes had signed up for the Waffen-SS in World War II, and that he had been a camp guard in Port Natal. Aantjes, at that time leader of the CDA party in the House of Representatives, resigned his position as parliamentary party leader and member of the House of Representatives the next day. Aantjes argued he had joined the Germanic SS because he believed that this was the only legal way to escape from forced labor in Güstrow. While De Jong assumed that Aantjes had joined the Germanic SS out of mere opportunism or sympathy for the Nazi ideology or the National Socialist Movement in the Netherlands, Aantjes said this was not the case.
A later investigation showed that Aantjes was right and had instead been interned at Port Natal, and De Jong admitted to having made a mistake. The affair was publicly seen as a way for Aantjes' political rivals to get rid of him.
^After a general election the previous cabinet continues as a caretaker. The intended Prime Minister is a member of Parliament until the next cabinet is inaugurated, and in that period functions as interim leader of the parliamentary party. So, from 8 June 1977 until 19 December 1977, Dries van Agt was technically the first leader of the CDA parliamentary party.