White Sands Missile Range (WSMR) is a United States Army military testing area and firing range located in the US state of New Mexico. The range was originally established in 1941 as the Alamogordo Bombing and Gunnery Range, where the Trinity test site lay at the northern end of the Range, in Socorro County near the towns of Carrizozo and San Antonio. It then became the White Sands Proving Ground on 9 July 1945.