The 32B (ShB) rocket was the competing design to the V-300/205 for the Berkut air defense system. The missile was designed by D L Tomashevich of Section 32 of KB-1. Forty of these rockets were built, and 36 fired during trials in 1953-1954. These tests showed that the 32B was superior to the 205. It was lighter, cheaper, and had more potential for use in future mobile versions of the system. But it would take time to organize production, and in the meantime the S-25 system was already being deployed with the 205 missile, since this had completed state trials first. The 32B experimental surface-to-air missile featured a solid propellant booster developed by I I Kartukov, a liquid propellant second stage powered by Isayev S2.168 and S2.168L engines, and the design group also completed a new launcher concept. These experimental systems provided the basis for the next generation of PVO surface-to-air missiles. Chief Engineer for this work was Pavel Dmitrevich Grushin, who would figure prominently in future surface-to-air missile systems development.