 Complete the following phrase:  On 4 April 1943, he became the commander of the 27th Fighter Aviation Regiment, where he flew the Bell P-39 Airacobra. At the beginning of 1944, Bobrov was removed from the command of the regiment, according to some information, this happened due to the personal hostility of representatives of the highest command personnel. As a result, he served as pilot technique inspector of the 190th Fighter Aviation Division from March 1944 to April 1944. On May 1944, fighter ace Alexander Pokryshkin invited Bobrov to his 9th Guards Fighter Aviation Division, where he became the commander of the 104th Guards Fighter Aviation Regiment. Bobrovs regiment took part in a number of offensive operations, including the breakthrough of the German defenses on the Neisse River and the 