Short-range anti-aircraft cannon The towed, single-barrel S-60 was put into service in 1950 by the Red Army. In addition to the traditional sight, the telemeter and the predictor the efficiency of the fire-control system was improved by installing SON-9 fire-control radar which were later replaced by RPK-1 radar. Use in Hungary The Hungarian People’s Army acquired the first S-60 cannon in 1959. The cannon served as a light anti-aircraft weapon in the anti-aircraft artillery units of the motorised, mechanized, and tank divisions, in the direct anti-aircraft artillery units of the ground forces, and in the air defence artillery units. The cannon and its fire-control system was produced in Hungary at the Diósgyőri Machine Factory from 1959 until the 1980s.