The ‘Schwerer Wehrmachtschlepper’ (sWS) was a heavy - half - track design produced for the German Army in WWII by Büssing - NAG, with production running from 1943 to 1945. This included a vehicle mounting the formidable 10 - barrelled ‘Nebelwerfer’ rocket launcher system . Revell’s model features injection moulded tracks and the option to create a rocket launch or ammunition carrier vehicle.