After the September 11 , 2001 attacks , the NORAD Air Warning Center 's mission " expanded to include the interior airspace of North America . " The Cheyenne Mountain Realignment was announced on 28 July 2006 , to consolidate NORAD 's day-to-day operations at Peterson Air Force Base with Cheyenne Mountain in " warm standby " staffed with support personnel
September 11 , 2001 attacks
September 11 attacks
North American Aerospace Defense Command