Main rocket engine production was done at the large Rocketdyne facility located in Canoga Park (1955-2013), in the western San Fernando Valley in Los Angeles, California.
The Santa Susana Field Laboratory (SSFL) was opened in 1947 by NAA in the nearby Simi Hills, to land-test forerunner and Rocketdyne engines. The Atomics International division began nuclear research and processing there in the 1950s. Closed since 2006, SSFL is a major state "Superfund" site for the cleanup of chemicals and radionuclides in the soil and groundwater, by Boeing, NASA, and DOE.))