"Proton" created as a combat system capable of carrying a nuclear warhead in the tens of megatons. Designer Vladimir Chelomei developed a unique arrangement of missiles and in a short time there was a whole family of "universal missiles", for short — SD. Heavy rocket "Proton" may pick up on low orbits up to 20 tonnes of payload. Such only by European rocket "Ariane". Since the creation of the "Proton" flew in three versions: UR-500, "Proton-K" and "Proton-M". In total, since 1965, committed — 384 launch.