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ISU-122S Tank Destroyer No.23, Soviet Army, Poland 1944
General Background
The ISU-122 was a Soviet WWII self-propelled gun designed mainly for an anti-tank role. Originally ISU hulls were being used to mount ML-20S 152mm gun-howitzers but the hull production quickly out paced the gun production so it was decided to mount surplus A-19 122 mm (4.8 in) guns. The A-19 was eventually with a semi-automatic breech block and the gun became the D-25S and the vehicle became the ISU-122S. The D-25S made it possible to double the rate of fire from 1.5 rounds/minute to 3 rounds.
Specifications :
Crew: 5 X Commander (Radio Operator), Gunner, Driver, 2 X Loaders
Top Speed Road: 37 km/h
Operational Range: 240 km
length: 6.8 m
Width: 3.07 m
Height: 2.46 m
Armament: 122 mm Main Gun
12.7 mm DShK anti-aircraft machine gun (not all units)
Gun Mantlet: 120 mm Thick