Dugway Proving Ground (DPG) is a US Army facility established in 1942 to test biological and chemical weapons, located about 85 miles (140 km) southwest of Salt Lake City, Utah and 13 miles south of the 2,624 sq mi Utah Test and Training Range forming the largest overland special use airspace in the United States. In 1968 more than 6,000 sheep were killed in the Dugway sheep incident. In 2015 it was revealed that the Dugway lab had inadvertently shipped live anthrax spores.