was vulnerable to enemy attack because it was on the Pacific Coast." By the end of that year, the U.S. Air Force had purchased the property but allowed the company to continue to run day to day operations of the site. This Tucson plant is still in operation under the ownership of Raytheon Missiles & Defense. Howard Hughes donated Hughes Aircraft to the newly formed Howard Hughes Medical Institute (HHMI) in 1953 allegedly as a way of avoiding taxes on its huge income. The next year, L.A. "Pat" Hyland was hired as vice president and general manager of Hughes Aircraft; he would ultimately become company president and CEO after Howard Hughes' death in 1976. Under Hyland's guidance, the Aerospace Group continued to diversify and become massively profitable, and became a primary focus of the company. The company developed radar systems, electro-optical systems, the first working laser, aircraft computer systems, missile systems, ion-propulsion engines (for space travel), and many other advanced technologies. The 'Electronic Properties Information Center' (EPIC) of the United States was hosted at the Hughes Culver City library in the 1970s. EPIC published the multi-volume Handbook of Electronic Materials as public documents. Nobel Laureates Richard Feynman and Murray Gell-Mann had Hughes connections: Feynman would hold weekly seminars at Hughes Research Laboratories; Gell-Mann shared an office with Malcolm Currie, later a chairman of the board and chief executive officer at Hughes Aircraft. Greg Jarvis and Ronald McNair, two of the astronauts on the last flight of the Space Shuttle Challenger, were Hughes alumni. Ground Systems Group Hughes Aircraft Ground Systems Group was located in Fullerton, California. The facility was 3 million square feet and included manufacturing, laboratories, offices, and a Munson road test course. It designed developed and produced the Air Defense Systems that replaced the Semi Automatic Defense Ground Environment (SAGE) in the United States with the Joint Surveillance System (JSS) AN/FYQ-93 including NORAD with Joint Tactical Information Distribution System (JTIDS) and provided defense systems and air traffic control systems around the world. These systems are massive and at its peak Ground Systems Group employed 15,000 people and generated revenue in excess of $1 billion per year. These systems included the following Ground Systems Group subsystems: Computer H5118, Consoles HMD-22 and HMD-44, Liquid Crystal Large Screen Displays, and Software that set the standard for software development based on science and engineering starting with the Combat Grande System. Ground Systems