Arms Control and Disarmament Agency
Originally an independent agency of the U.S. government, the arms control functions of the Arms Control and Disarmament Agency are now part of the U.S. Department of State, under the Under Secretary of State for Arms Control and International Security. It was chartered to "to strengthen the national security of the United States by formulating, advocating, negotiating, implementing and verifiying effective arms control, nonproliferation, and disarmament policies, strategies, and agreements."
Its role was more in the official negotiation of agreements, while the United States intelligence community had responsibility for national means of technical verification of weapons of mass destruction. The Defense Threat Reduction Agency manages the operations of bilateral inspection programs.