Hitler became chancellor (head of the government) of Germany in 1933. Two years later, when Barbie was twenty-two, he joined the Shutzstaffel (SS), the Nazi Party's security squad that swore loyalty not to Germany but to Hitler. He served in the Sicherheitsdienst (SD), the intelligence and security branch of the SS, and was assigned to a number of posts in Europe for the next six years. During this time, as the German war machine swept westward, Barbie won a reputation as a shrewd, dedicated SS officer. He earned increases in his position, and admiring superiors expressed their approval of his performance.