NAVSTARThe U.S. Air Force launches NAVSTAR-1, the first of a planned constellation of experimental satellites supporting the Department of Defense’s Global Positioning System project. Envisioned as a network of satellites providing extremely accurate location data for military purposes, the Global Positioning System will later grow to service civilian customers as well. Three other NAVSTAR satellites are launched in 1978 alone, and later satellites in the original NAVSTAR series will be launched betwen 1980 and 1985. Unlike the later, more advanced NAVSTAR II satellites of the 1990s, data from the original NAVSTAR constellation is restricted to the American military.