Nevada Test Site
The Nevada National Security Site (NNSS; N2S2) initially named the Nevada Proving Ground (1951–1955), and later the Nevada Test Site (NTS; 1955–2010)) is a reservation of the United States Department of Energy located in the southeastern portion of Nye County, Nevada, approximately 65 mi (105 km) northwest of Las Vegas. The site was established in December 1950 when President Harry S. Truman authorized the designation of a portion of the Nellis Air Force Gunnery and Bombing Range for testing American nuclear devices by the US Atomic Energy Commission (AEC).