Comparing: AT 15A vs. M56 Scorpion

Assault tank conceived for breakthrough attacks on enemy fortifications. The design project was ready on October 5, 1943. No prototypes were built. However, the project became the basis for the A39 Tortoise heavy assault tank.

The M56 SPG was intended to support airborne units as a light tank destroyer that could be transported by cargo planes or inserted by parachute or glider. The vehicle was mass produced from 1953 through 1959, but it was not popular and was soon replaced by the Sheridan light tank. The Scorpion was occasionally used to provide artillery support in Vietnam.