Приволжский военный округ
Tank units of the Red Army had 57 ST-26 engineer tanks on June 1, 1941: 9 in the Far Eastern Front, 26 in the Moscow Military District, 2 in the Leningrad Military District, 2 in the Kiev Special Military District, 8 in the Western Special Military District, 1 in the Volga Military District, and 9 vehicles were in military supply depots. From those ST-26 engineer tanks only 12 were in good order, the others required repair.