A number of environmental groups are circulating a sign-on letter to the Interior Department secretary in an effort to coalesce opposition to the Army's plans to expand a top training center in California, which they say will threaten endangered species, deteriorate already poor air quality, and eliminate the possibility of designating protected wilderness in the Avawatz Mountains. The groups are gathering opposition to the enlargement of Ft. Irwin's National Training Center (NTC) just as the Defense and Interior departments are...