http://www.armscontrol.org The Arms Control Association is a national non-partisan membership organization that seeks to build public understanding of and support for effective arms-control policies. It produces the journal Arms Control Today and its website provides information on a range of issues relating to military security.

http://www.defense.gov/ The web portal for the United States Department of Defense, a crucial resource for understanding contemporary US defence policy and thinking.

http://www.fas.org The website of the Federation of American Scientists. Provides excellent resources on the military capabilities and policies of key states.

http://www.sipri.org The website of the excellent Stockholm International Peace Research Institute.