provided general systems engineering and technical direction for the Titan II missile, first tested in 1962, which became the launch vehicle for Project Gemini. Other notable projects of the 1960s include the advanced ballistic re-entry system (ABRES), the Air Force's Manned Orbiting Laboratory (MOL), the Defense Satellite Communications System (DSCS), and the Defense Support Program (DSP). During the 1970s, Aerospace began performing advanced space program analysis and program studies for NASA's development of the Space Transportation System (STS), more commonly known as the Space Shuttle. Aerospace also began tests on airborne UHF terminals for the Air Force Satellite Communications System, AFSATCOM. In the mid-70s Aerospace assumed general systems engineering and integration responsibility for the Defense Meteorological Satellite Program (DMSP). Beginning in 1973, a program office was established to assist the Air Force in the creation of the Global Positioning System (GPS). In recognition of their GPS collaboration, Aerospace shared the 1992 Robert J. Collier Trophy, the nation's highest award for aeronautical achievement, "for the most significant development for safe and efficient navigation and surveillance of air and spacecraft since the introduction of radio navigation 50 years ago." Throughout the 1980s, Aerospace supported the Inertial Upper Stage (IUS), the Strategic Defense Initiative (SDI), the Milstar and DSCS satellite communication systems, and antisatellite (ASAT) programs. They provided planning, design, and evaluation for the Air Force Satellite Control Network (AFSCN) and the Consolidated Space Operations Center at Schriever Air Force Base in Colorado. During this same time period, the company also provided systems engineering and integration for launch vehicles, including the Atlas, Titan II, Titan IV, and Delta II. In the 1990s, Aerospace participated in the planning and development of system requirements for the Evolved Expendable Launch Vehicle (EELV) program, the next generation of launch vehicles. They continued to provide launch vehicle systems engineering for the Atlas II, Delta III, and Titan IVB. Satellite program support included Wideband Gapfiller, Space Based Laser, the Ultrahigh-Frequency Follow-On program, and the Global Broadcast Service. Throughout the second half of the 90s, the corporation conducted independent assessments for the International Space Station, provided technical support for the Cassini spacecraft, and supported the acquisition of the Space-Based Infrared System (SBIRS) satellite constellation. Most recently, The Aerospace Corporation provided further technical assistance to EELV programs including the Atlas V and Delta IV, and supported planning for Space Radar to provide global persistent intelligence, surveillance, and reconnaissance to the Department