America's first tank destroyer, the M10 was mounted on a Sherman hull and had an open-topped turret carrying a 3-inch (76.2mm) cannon capable of penetrating 8.8cm of armor at 1,000m distance. Due to the need for high mobility, the M10 wore relatively thin armor plating. However, auxiliary armor could be added easily using the bolts located on the turret and hull. Facing a baptism of fire against the Germans in Tunisia in 1943, the M10 Tank Destroyer went on to serve in Italy, Western Europe and the Pacific.