M55 self propelled howitzer

The M55 is an American fully enclosed and armored self-propelled artillery based on the M53 155 mm self-propelled artillery. It has a 203.2 mm (eight-inch) howitzer which can traverse 30° left or right, carrying 10 rounds of ammunition when fully combat loaded. The gun has a maximum range of 10.51 miles (16.92 kilometers) with a rate of fire of one round every two minutes. The M55 is lightly armored, 25 mm maximum, but sufficient to protect the crew from indirect artillery hits and small arms fire.