Joint Defence Facility Nurrungar (JDFN), located on the edge of Island Lagoon, approximately 15 km south of Woomera, South Australia was a facility operated jointly by the Australian Department of Defence and the United States Air Force from 1969 through 1999. Its official area of emphasis was space-based surveillance, in particular the early detection of missile launches and nuclear detonations using U.S. Defense Support Program satellites in geostationary orbits.