Under Secretary Home Under Secretary Home About Us Remarks and Releases HomeBureaus & OfficesUnder Secretary for Arms Control and International Security...Under Secretary Home hide Under Secretary for Arms Control and International Security Our Mission The Office of the Under Secretary of State for Arms Control and International Security leads the interagency policy process on nonproliferation and manages global U.S. security policy, principally in the areas of nonproliferation, arms control, regional security and defense relations, and arms transfers and security assistance. Senior Official (T) Brent T. Christensen Follow Us: Twitter Bureaus Bureau of Arms Control, Deterrence, and Stability Bureau of International Narcotics and Law Enforcement Affairs Bureau of International Security and Nonproliferation Bureau of Political-Military Affairs