American m163 20mmm 6-Tube Vulcan anti-aircraft gun is fired from the ground to air targets. It is a 6-joint and m163 20mm Vulcan self-propelled anti-aircraft gun. It has high firing speed and high fire density. The shooting mode is flexible, easy to operate and free from electronic interference. The armor has good protection performance and strong mobility. The disadvantage is that the range is short, the power is insufficient, and the early models do not have all-weather combat capability. It is mainly equipped with the mechanized infantry division and armored division of the US Army. It belongs to the mixed air defense artillery battalion and is used in conjunction with the small Quercus air defense missile. It is mainly used to cover forward forces, deal with low altitude aircraft and armed helicopters, and also deal with light armored targets on the ground.