Onizuka Air Force Station is a US Air Force installation in Sunnyvale, California. It is a large, blue, windowless, concrete building, known locally as the Blue Cube, with an array of parabolic dish antennas used for control of military satellites.
Built in 1960 on land near Moffett Field, purchased from Lockheed Martin (then Lockheed), the station was originally known as the Air Force Satellite Test Center. It was later renamed the Air Force Satellite Control Facility, and Sunnyvale Air Force Station. In 1986, the base was renamed in honor of LtCol Ellison Onizuka, one of the astronauts who died in the Space Shuttle Challenger explosion.
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