Comparing: T28 vs. ISU-130

In March 1944, the U.S. Army placed an order for five prototypes of heavy vehicles designated T28. As a result, the T95 SPG was built.

This heavy SPG on the basis of the ISU-122S was developed in 1944, with a prototype built in October. The 130-mm S-26 gun, based on the B-13 naval gun, was mounted on the ISU-122S. The vehicle underwent automotive and firing trials by 1945, but penetration characteristics were inferior to those of the 122-mm guns, and the war was drawing to a close, so the vehicle never entered service.