Office Home Office Home About Us Key Topics HomeBureaus & Offices > Bureau of International Security and Nonproliferation ...Office of Missile, Biological, and Chemical Nonproliferation hide Office of Missile, Biological, and Chemical Nonproliferation Our Mission The Office of Missile, Biological, and Chemical Nonproliferation leads working-level U.S. government efforts to impede, roll back, and eliminate the proliferation of chemical and biological weapons, missile delivery systems for weapons of mass destruction, and related equipment, materials, and technology.