Douglas PGM -17
Thor was the first operational ballistic missile deployed by the USAF. Named after the Norse god of thunder, it was deployed in the United Kingdom between 1959 and 1963 as an intermediate range ballistic missile (IRBM) with thermonuclear warheads. Thor was 65 feet (20 m) in height and 8 feet (2.4 m) in diameter. It was later augmented in the U.S. IRBM arsenal by the Jupiter. After retirement as an IRBM, disarmed PGM-17As, as well as new-built Thors, were used by the USAF as space launch vehicles under the basic designation of SLV-2. The Thor was developed by Douglas into the very successful Delta family of space launchers, still in use today.