The military models were equipped with a 7.62 mm (.30 in) ShKAS machine gun, and later with a 12.7 mm (.50 in) UBK heavy machine gun.
Vladivostok Air also began basic use of the Lisunov Li-2 aircraft, which would continue to operate regular passenger flights from Ozernye Klyuchi Airport to Khabarovsk for the next 15 years.