Vernichtungslager Belzec
On 20 April 1942, Franz was promoted to "Oberscharführer" (Staff Sergeant). In spring of 1942, Franz, along with other veterans of Action T4, went to Lublin concentration camp complex in the "Generalgouvernement", and was posted to the Bełżec extermination camp, where he stayed until the end of August 1942.