In 1951, North American began to develop booster and sustainer engines for the Atlas intercontinental ballistic missile, as well as the Thor and Jupiter intermediate-range ballistic missiles. In 1955, the company established Rocketdyne as a separate division to design, develop and manufacture large, liquid-propellant rocket engines at Canoga Park in Los Angeles. During 1956, Rocketdyne delivered its first Atlas, Thor and Jupiter engines.