This 'Duster' cleaned up in the air and on the ground
World War II proved that tanks were very vulnerable to air attack. To deal with that threat, the United States and Soviet Union both developed some anti-aircraft guns that could keep up with and protect that valuable armor.
The Russians have invested heavily in tactical anti-air in recent years, developing systems that can, theoretically, shoot down an entire squadron of planes. Today, the best American self-propelled anti-aircraft gun is the M163 Vulcan Air Defense System. But before the Vulcan, there was the Duster.