The Sycamore Canyon Test Site is a rocket and weapons field test site east of San Diego, which has been closed and partially demolished in recent years. The operational areas are mostly in the canyons in the otherwise open and undeveloped hills, south of Poway and east of the Miramar Naval Air Station. The site was developed in the 1950s for testing the Atlas missile, the nation’s first intercontinental missile, being developed by the Convair division of General Dynamics, based out its new complex in Kearny Mesa. The site was further developed by other companies. Lockheed Martin referred to its facilities here as the Sycamore Test Facility (STF), an eight-acre test site established by the company in 1964, which was used for liquid hydrogen and other types of cryogenic and structure testing programs. Hughes Missiles and Space operated its Site 7 here, where work was done on Tomahawk missiles. This division of Hughes was later purchased by Raytheon.