White Sands Missile Range (WSMR) is a United States Army rocket range of almost 3,200 sq mi (8,300 km²) in parts of five counties in southern New Mexico. The largest military installation in the United States, WSMR and the 600,000-acre (2,400 km²) McGregor Range Complex at Fort Bliss to the south (southeast Tularosa Basin and on Otero Mesa) are contiguous areas for military testing.