The M42 was developed to replace the older M16 and M19 half-tracks, which had less firepower and mobility.
The M42 Duster was based on the chassis of the M41 Walker Bulldog, a light tank, which allowed it to maintain a high level of mobility and speed, making it versatile for various terrains. It had a crew of four: a commander, a gunner, a loader, and a driver.
Although it was initially intended for anti-aircraft use, the M42 Duster saw combat in several conflicts, including the Vietnam War, where it was adapted for ground combat roles as well, particularly in providing fire support. Its powerful 40mm cannons made it effective against infantry, vehicles, and fortified positions in addition to aircraft.
Though it was gradually phased out in the 1980s, the M42 Duster remains a notable part of U.S. military history for its innovative design and contributions to air defense.