Most of the MiG-3s assigned to the interior military districts were transferred to the PVO where their lack of performance at low altitudes was not so important. On 10 July 299 were assigned to the PVO, the bulk of them belonging to the 6th PVO Corps at Moscow, while only 293 remained with the VVS, and 60 with the Naval Air Forces, a total of only 652 despite deliveries of several hundred aircraft. By 1 October, on the eve of the German offensive towards Moscow codenamed Operation Typhoon, only 257 were assigned to VVS units, 209 to the PVO, and 46 to the Navy, a total of only 512, a decrease of 140 fighters since 10 July, despite deliveries of over a thousand aircraft in the intervening period. By 5 December, the start of the Soviet counter-offensive that drove the Germans back from the gates of Moscow, the Navy had 33 MiGs on hand, the VVS 210, and the PVO 309. This was a total of 552, an increase of only 40 aircraft from 1 October.