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The Proliferation Security Initiative is a global effort to stop trafficking of weapons of mass destruction, their delivery systems and related materials to and from actors of proliferation concern. U.S. involvement stems from a national strategy which recognizes the need for more robust tools to stop proliferation and identifies interdiction as an area of greater focus.
The Quadrennial Defense Review, or QDR, is a legislatively-mandated review of Defense Department strategy and priorities. The QDR will set a long-term course for DoD as it assesses the threats and challenges that the nation faces and re-balances DoD's strategies, capabilities, and forces to address today's conflicts and tomorrow's threats.
Biological, chemical and nuclear terrorist attacks; extreme weather events; and emerging infectious diseases all pose security threats unbounded by state, country and regional borders. The Department of Defense uses global biosurveillance networks to identify and track such threats and to help defend the nation.