Sunnyvale is the seventh most populous city in the San Francisco Bay Area and one of the major cities comprising Silicon Valley. It is bordered by portions of San Jose to the north, Moffett Federal Airfield to the northwest, Mountain View to the northwest, Los Altos to the southwest, Cupertino to the south, and Santa Clara to the east. It lies along the historic El Camino Real and Highway 101.
As part of California's high-tech area known as Silicon Valley, Sunnyvale is the headquarters location of many technology companies and is a major operating center for many more. It is also home to several aerospace/defense companies. Sunnyvale was also the home to Onizuka Air Force Station, often referred to as "the Blue Cube" due to the color and shape of its windowless main building. The facility, previously known as Sunnyvale Air Force Station, was named for the deceased Space Shuttle Challenger astronaut Ellison Onizuka. It served as an artificial satellitecontrol facility of the U.S. military until August 2010 and has since been decommissioned and demolished.
Sunnyvale is one of the few U.S. cities to have a single unified Department of Public Safety, where all personnel are trained as firefighters, police officers, and EMTs, so they can respond to an emergency in any of the three roles.
Library services for the city are provided by the Sunnyvale Public Library, located at the Sunnyvale Civic Center.
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