Two Deutsche Afrika Korps Panzer IV ausf F including turmnummer (turret number) 413 pass a knocked-out captured Carden Lloyd Universal Carrier Mark 1 serial number T33417 armed with a Boys .55 caliber (13.9mm) anti-tank gun. The Universal Carrier is painted in the Caunter camouflage scheme, which used grey, blue, black, sand, and brown paint, or whatever was available, to form straight angular lines that were thought to "dazzle" whomever saw the vehicle in the desert, making it hard to judge size and distance. The Carrier has a Nazi flag over it to prevent an air attack by friendly German aircraft; this was common practice to mark captured vehicles with the Swastika flag. Panzer Armee Afrika had more captured vehicles than most other German units, because of lack of supplies. The Panzer IVs, especially the early ausf G models with a longer 75mm KwK 40 L/43 (3 inch) gun, contributed greatly to the Germans' mobility and firepower. Only the M3 Grant/Lee and the M4 Sherman tanks were able to penetrate their armor, and often only with a shot to the rear. The British cruiser tanks and the American M3 Stuart were totally unable to stop the Panzer IV. The Panzer IV ausf G could stop any Allied tank before the tank was in range. The British called the ausf G the "Mark IV Special." After the war the early versions were called the ausf F2. At the second Battle of El Alamein, Rommel had eight Panzer IVs with 75mm KwK 37 L/24 gun and 30 Panzer IV with a long 75mm KwK 40 L/43 gun.