 Some I-5s were used by the 605th and 606th Fighter Regiments ("Istrebitel'nyye Aviatsionnyye Polki" (IAP)) during the defence of Moscow as night bombers until re-equipping in February 1942.The 2nd Ground Attack Regiment ("Shturmovoy Aviatsionnyi Polk" (ShAP)) was raised in September 1941 in the Crimea from reservists and the Kachin Flying School.By 10 October thirty-two I-5s were on hand, although attrition had reduced them to sixteen serviceable.