CFS – Schwerer Wehrmachtschlepper (Armored) Upgrade. New version of Schwerer Wehrmachtschlepper, now with the AA gun Flak 38. The Schwerer Wehrmachtschlepper (Heavy Military Tractor), or sWS for short, was a German World War II half-track flat-bed cargo vehicle developed by BA_ssing-NAG. The unarmored models were used as supply vehicles and as tractors to haul things. The semi-armored version could mount a medium anti-aircraft gun while the fully armored model carried a 10 barrel rocket launcher (Nebelwerfer). Less than a thousand were built before the end of the war, but production continued after the war of an improved model in the Tatra plant in Czechoslovakia. By Edmundo Abad.