Military

• DefenseLink
• Army
• Air Force
• Navy
• Marines
• Training and Doctrine Command (TRADOC)
• NATO
• CRS reports on national security issues
• National WWII Memorial
• Vietnam Veterans Memorial (searchable)
• OnPower.org (libertarian perspective on military power)

Intelligence, Terrorism, Homeland Security

• Intelligence Community
• CIA archives
• Strategic Intelligence Homepage
• Intelligence Documents (Fed of Am Scientists)
• Venona documents (declassified Soviet intelligence intercepts)
• Terrorism Research Center
• National Security Archive (declassified documents)
• Homeland Security Institute
• US Department of Homeland Security
• US Treasury Office of Foreign Asset Control (economic sanctions info)

International

• Nationmaster (international comparative data)
• Free the World (economic freedom data)
• Freedom House (political freedom data)
• Pew Global Attitudes Project
• World Public Opinion
• International Statistical Agencies
• National Constitutions
• State Department
• National Endowment for Democracy
• UN
• Organization for Economic Cooperation & Development
• International Monetary Fund
• Europa
• European Union in US
• Individual links to country info
• Foreign embassies in US
• Multilateral treaties & conventions
• Foreign Affairs (journal)
• Foreign Policy (journal)
• Cold War documents