 In 1942, the SS began to use its forced labor supply for armaments production.Because it was more economical to rent out prisoners to private firms, subcamps were set up near factories which had a demand for prisoner labor.Private firms paid the SS between 4 and 6 Reichsmarks per day per prisoner, resulting in an estimated 95,758,843 Reichsmarks in revenue for the SS between June 1943 and February 1945.