This presentation gives an overview of various chemical warfare agents and their relevance. Agent characteristics and effects as well as patient presentation and management are among the topics covered. According to chemical agent definition (FM 8-285)a chemical agent is: "A chemical substance...intended for use in military operations to kill, seriously injure, or incapacitate humans (or animals) through its toxicological effect." A compare and contrast is given for chemical agents (chemical warfare agents), biological agents (biological warfare agents) toxins, and "toxicants". Riot control agents are among the excluded agents, as are herbicides and smokes. Among the official chemical agents are toxic agents such as lung damaging agents (choking agents), blood agents (cyanogens), blister agents (vesicants), and nerve agents (anticholinesterases). An overview of the effects of these agents, with diagrams is included.