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U.S. SPACE LAUNCH SYSTEMS

Space systems can be divided into two categories: the launch vehicle and the payload. The launch vehicle, commonly called the booster, propels the spacecraft and its associated payload into space. Typically for military missions, a specific payload is always flown on a specific booster. For example, the Global Positioning System (GPS) satellites are always launched on a Delta II launch vehicle. The same is true for most of our military payloads. Delta Delta rockets are a family of medium lift class vehicles by which a variety of satellites have been launched as part of U.S. and international space programs. It was originally designed as an interim launch vehicle consisting of a Thor Intermediate Range Ballistic Missile (IRBM) first stage and Vanguard second and third stages. Continued improvements allow the Delta to inject over 4,000 pounds into a geosynchronous transfer orbit (GTO). The National Aeronautics and Space Administration (NASA) placed the original contract with the Douglas Aircraft Company in April 1959. The early three-stage vehicle had a length of 85.4 feet, a first stage diameter of eight feet and a lift-off weight of 113,500 pounds. The modified Thor first stage had a thrust of about 170,000 pounds. On 13 May 1960, the first Delta failed to achieve orbit, but subsequent vehicles proved to be highly reliable. Built by McDonnell Douglas (which merged with Boeing in August 1997), The Delta II entered the Air Force inventory in February 1988. The vehicle was developed after the Air Force decided to return to a mixed fleet of expendable launch vehicles following the Challenger disaster and other launch failures. The first Delta II was successfully launched on 14 February 1989. The Delta II 6925 carried nine GPS satellites into orbit. The Delta II model 7925, the current version of this venerable launch vehicle, boosted the remainder of the original GPS constellation and is currently used to launch the new Block 2R version of GPS. The Delta II's first stage is 12 feet longer than previous Deltas, bringing the total vehicle height to 130.6 feet. The payload fairing (shroud covering the third stage and the satellite) was widened from eight to 9.5 feet to hold the GPS satellite. The nine solid-rocket motors (SRM) that ring the first stage contain a more powerful propellant mixture than previously used. Delta 7925 began boosting GPS satellites in November 1990. The Delta 7925 added new solid rocket motors with cases …