This IRBM was 20 m (65 feet) in height and 2.4 m (8 feet) in diameter. It was the USAF's first operational ballistic missile. It was deployed in England from 1959 to 1963. It carried a thermonuclear warhead. It speedy development was in answer to the perceived threat from the Soviet Union. It was withdrawn as soon as the ICBM was operational in the USA.