Center for Strategic and Bugetary Assessments (CSBA) is an independent, non-partisan policy research institute established to promote innovative thinking and debate about national security strategy and investment options. http://www.csbaonline.org/
Brookings Institution: a nonprofit public policy organization based in Washington, DC. http://www.brookings.edu/
RAND: The RAND Corporation is a nonprofit institution that helps improve policy and decisionmaking through research and analysis. http://www.rand.org
Strategic Studies Institute: U.S. Army War College's institute for geostrategic and national security research and analysis. http://www.strategicstudiesinstitute.army.mil/
Center for Strategic and International Studies (CSIS): A bipartisan, nonprofit organization headquartered in Washington, DC, CSIS provides strategic insights and policy solutions to decisionmakers in government, international institutions, the private sector, and civil society. http://csis.org/
Center for Naval Analyses (CNA): CNA is a non-profit research organization that operates the Center for Naval Analyses and the Institute for Public Research. It is based in VA. http://www.cna.org/