In addition to the 426 US6 U-5
delivered, and due to the lack of domestic chassis, the Red Army fitted the short-wheelbased U2
with self-produced 1,200gal. petrol tank bodies and called them BZ-35S
, the "S" as the distinction to the domestic ZIS-6
The refuellers served successfully at the Red Airforce (»VVS
«) as well as at the ground forces where they filled the gap between the railway and the ever advancing troops.