White Sands Missile Range (WSMR), home to White Sands Test Center (WSTC), is where the United States entered both the atomic and space ages. On July 16, 1945, the world's first atomic bomb was successfully tested at its Trinity Site. At WSMR, the U.S. put the earliest rockets into the upper reaches of Earth's atmosphere. At 3,200 square miles, the range is the largest military installation in the country, and it can also add another temporary 2,400 square miles for tests needing more area. The headquarters area is 20 miles east of Las Cruces, New Mexico, and 45 miles north of El Paso, Texas.