Comparing: AT 2 vs. S35 CA vs. SU-85I

Design for an assault tank to break through enemy defensive lines. The design was completed by May 15th, 1943. No prototypes were built, the project helped set the stage for another heavy assault tank, the A39 Tortoise.

The design called for the conversion of tanks into tank destroyers by mounting a 17-pounder gun into an open-topped, lightly armored cabin.

A proposed modification of captured German Pz.Kpfw. III tanks, which were to be mounted with the 85 mm gun. Never entered mass production nor saw service.