T249 Vigilante
The T249 Vigilante was a prototype 37 mm self-propelled anti-aircraft gun (SPAAG) designed as a replacement for the Bofors 40 mm gun in both towed and self-propelled (M42 Duster) forms in US Army service. The system consisted of a 37 mm T250 six-barrel rotary cannon mounted on a modified M113 armored personnel carrier chassis, with an alternate trailer-mounted variant designated T248 Vigilante A. By the early 1960s, the US Army declared that gun-based systems were outdated, and canceled further development in favor of the MIM-46 Mauler missile system that also failed to enter service.