The U.S. Navy conducted a preliminary inspection of the Salton Sea in January 1940, and the Salton Sea Test Base (SSTB, run by Sandia Labs) was initially commissioned as the Naval Auxiliary Air Station Salton Sea, in October 1942. The SSTB, just to the southeast of Salton City, originally functioned as an operational and training base for seaplanes. Additional activities at the base included experimental testing of solid-fuel plane-launched rockets, jet-assist take-off testing, aeroballistic testing of inert atomic weapon test units at land and marine target areas, training bombing at marine targets, testing of the effects of long-term storage on atomic weapons, testing of the Project Mercury space capsule parachute landing systems, parachute training and testing, and military training exercises. The base was abandoned in 1978.