Fort Greely is a launch site for anti-ballistic missiles (ABMs), designed to shoot down enemy missiles that might be coming over the arctic to bomb the USA. The only other fixed battery of ABMs is at Vandenberg Air Force Base in California. Greely is a site for the Cold Region Test Activity and the Northern Warfare Training Center, however, recent BRAC decisions relocated much of these activities to nearby Fort Wainwright. Fort Greely's large ground area, 662,000 acres, is still used as a training area. Fort Greely was used for chemical weapons training in the 1950s and 1960s, and some sites still have chemical agents present. Radioactive activities, including experiments with nuclear reactors, have also had an impact on the site.