Northrop F-5F aggressor squadron is based in an air station that is designated as a superfund site due to what ?
Marine Aircraft Group 41 Marine Aircraft Group 41 (MAG-41) is a United States Marine Corps reserve aviation unit based at Naval Air Station Joint Reserve Base Fort Worth, Texas that is currently composed of one F/A-18A+ squadron, one KC-130T squadron, an aviation logistics squadron, as well as detachments from wing support and air control squadrons. Following decommissioning of Marine Aircraft Group 46 in 2009, MAG-41 also assumed command responsibility for the geographically separated Northrop F-5F aggressor squadron based at Marine Corps Air Station Yuma, Arizona and a Boeing Vertol CH-46 squadron HMM-764 based at Edwards Air Force Base, California. HMM-764 transitioned to the MV-22B in 2013 and relocated to MCAS Miramar.
Ground Equipment Facility J-31 Ground Equipment Facility J-31 (San Pedro Hill Air Force Station during the Cold War) is a Joint Surveillance System radar site of the Western Air Defense Sector (WADS) and the Federal Aviation Administration's air traffic control radar network  for the Los Angeles Air Route Traffic Control Center. The facility's Air Route Surveillance Radar Model 1E with an ATCBI-6 beacon interrogator system are operated by the FAA and provide sector data to North American Aerospace Defense Command. The site provided Semi-Automatic Ground Environment data to the 1959-66 Norton AFB Direction Center for the USAF Los Angeles Air Defense Sector. The site also provided Project Nike data to the 1960-74 Fort MacArthur Direction Center ~3 mi away for the smaller US Army Los Angeles Defense Area—as well as gap-filler radar coverage for the 1963-74 Integrated Fire Control area of Malibu Nike battery LA-78 on San Vicente Mountain.