In the postwar period the plans for the organization of our armored forces military experts associated primarily with the latest heavy tank is-3. Commercially the tank was produced at the Chelyabinsk Kirov plant in 1945-1946 very fast pace. So, in the summer 1945 issue was, for example, 250 items per month. There were manufactured 2305 machines.
However, in the beginning of the service in the army revealed a number of fundamental flaws. The fact that many of the mechanisms and units, the is-3 proved to be unsuitable for prolonged use in peacetime because of the very low reliability. Apparently, affected the calculation of the short military life of machinery, which lasted in combat just a few weeks. Therefore, after 1948, they were subjected to alteration and modernization program of eliminating design flaws at the same Kirov factory in Chelyabinsk.
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