"The attacks of September 11, 2001 have brought about massive increases in spending for homeland security and have established defense of the homeland as a primary responsibility of the Defense Department. DoD's most recent Quadrennial Defense Review clearly states that defense of the continental United States has become a top priority for the military: 'The highest priority of the United States military is to defend the nation from all enemies. The United States will maintain sufficient military forces to protect the U.S. domestic population, its territory and its critical defense-related infrastructure against attacks emanating from outside U.S. borders as appropriate under U.S. law.'"
Naval Postgraduate School, Center for Contemporary Conflict: http://www.ccc.nps.navy.mil
Strategic Insights (March 2002), v.1 no.1