Near the old Sycamore Test Facility:
The Sycamore Canyon Test Facility is a historic rocket and weapons testing site located about 17 miles north of downtown San Diego, east of MCAS Miramar. Established in 1956, it was used heavily by Convair, Hughes, and Lockheed Martin for static rocket firings, cryogenic testing, and assembling missiles like the Atlas ICBM. [1, 2, 3, 4]