On 20 August, Isaev, who had been the Unit Navigator, and then Commanding Officer, and with whom Pokryshkin had strong differences, took measures to have Pokryshkin stripped of his Hero of the Soviet Union, expelled from the regiment, and hauled before a tribunal. From 10 PM that night at least through the following day, Pokryshkin, 298th Fighter Aviation Regiment's Major Taranyenko, and the 16th Guards' Commissar, Gubarevim, and some "Osobists"(NKVD people) completed interrogations and investigations. Gubarevim, with difficulty, was able to clear Pokryshkin's name and reputation, and "Sasha" was thereupon awarded his second Hero of the Soviet Union on 24 August 1943.