Office Home Office Home About Us Key Topics HomeBureaus & Offices > Bureau of International Security and Nonproliferation ...Office of Conventional Arms Threat Reduction hide Office of Conventional Arms Threat Reduction Our Mission The Office of Conventional Arms Threat Reduction leads efforts to prevent the proliferation of destabilizing conventional weapons and advanced technologies, including through interdiction and by leading U.S. participation in the Wassenaar Arrangement. CATR also leads on export controls to protect the use of dual-use goods—including semiconductors—and prevent their use in ways that harm national security or abuse human rights.