Special Purpose Vehical, for example Sd.Kfz. 234 "Puma" SS / Waffen-SS - 'Schutzstaffel': Hitler's personal bodyguard formed in 1925, grew to contain the Gestapo and Totenkopf . SPG - Self Propeled Gun (Stug, ISU-152 , Bishop ) Stg / StGw - Sturmgewehr (Storm Rifle, eg Stg 44) StuG (3 / 4)