US National Security Key Concepts, Agencies, and Strategies Practice Exam

WMD stands for weapons of mass destruction, meaning weapons designed to cause very large-scale casualties and widespread damage across wide areas. The three classic categories are nuclear, chemical, and biological weapons. Nuclear weapons release massive energy through fission or fusion, producing devastating blasts, heat, and radiation that affect huge areas. Chemical weapons use toxic chemicals to injure or kill through inhalation, skin contact, or ingestion, with effects that can spread in the environment. Biological weapons deploy living organisms or their toxins to cause disease, potentially spreading and causing outbreaks beyond the immediate target. Some discussions also mention radiological weapons as a separate consideration, but the standard three to know are nuclear, chemical, and biological. Other terms, like weapons of mass persuasion, refer to influence or propaganda and are not WMDs.