The 2S3 self-propelled howitzer is a 152mm self-propelled howitzer developed by the former Soviet Union in the late 1960s. This type of howitzer is composed of a PI-20 howitzer and a Sam-4 missile launch vehicle chassis, with a barrel length of 29 times the caliber, equipped with muzzle brakes and smoke exhaust devices, and loaded with ammunition by a mechanical loader. The body is enclosed and has strong three defense capabilities, making it suitable for air transportation. When firing grenades, the 2S3 howitzer has an initial velocity of 670 meters per second, a maximum range of 18.5 kilometers, and a maximum firing rate of 4 rounds per minute. It can fire various types of ammunition such as grenades, rocket extended range shells, armor piercing shells, as well as nuclear and chemical bombs.