Comparing: AT 15A vs. T28 Concept

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 development of this heavy breakthrough tank began in September 1943. It was planned to utilize certain components of the M6 tank as well as the electromechanical transmission and 100-mm T5 gun, mounted in a turret of limited traverse with 203-mm armor protection. The vehicle was intended to assault the fortifications of the German "Siegfried Line" (known as the "Westwall" to the Germans). The U.S. land forces rejected the project during the design phase. The vehicle was later modified into the T95 heavy breakthrough tank.