Yuma Proving Grounds, Arizona

A 1,300 square mile test and evaluation range for military weapon systems, including manned and unmanned aircraft systems, tanks, artillery, mines, tactical parachutes, and electronic countermeasures. Operated by the Army, with about 2,000 workers, the Proving Grounds have an average of 100 tests operating simultaneously within its complex of heavily instrumented and specialized test areas. The reservation is roughly L-shaped, with aircraft-related activities taking place on the north-south Cibola Range, and artillery and tank activities on east-west Kofa Range. The Middle East cross country course is one of several ground courses for testing motive equipment for use in desert warfare environments.