DOD websites:
Air War College - Gateway to Homeland Defense & Homeland Security Studies
Air University Library Subject Research Guides
U.S. Army War College Strategic Studies Institute The Strategic Studies Institute (SSI) is the primary research faculty of the U.S. Army War College. The Strategic Studies Institute identifies international security issues likely to affect the United States, its friends, and potential adversaries; analyzes national security issues and, through the timely publication of studies and conduct of conferences, informs Army leaders of policy options; and provides the U.S. Army with a source of ideas, criticism, innovative approaches, and independent analyses. Of particular value is this site's 'Hotlinks to Military and Strategy Related Sites'.
From the National Archives: America's Founding Documents -The Declaration of Independence, the Constitution and the Bill of Rights