Blösche participated in right-wing youth organizations promoting Nazi causes, and he joined the Sudeten German Party, a pro-Nazi group advocating German expansion. In 1938, he joined the Nazi Party and the SS after Germany annexed the Sudetenland. Blösche, who had previously volunteered for local SS, was drafted by the Waffen-SS on 4 December 1939 and reported to training the following day at Pretzsch Castle. He completed his training on 14 March 1940 and was assigned to Warsaw. He was shortly assigned to patrolling of the Bug River.