This special issue of Military Psychology reports behavioral, pharmacological, and toxicological science research on military performance as it is affected by chemical warfare agents (CWAs) and their pharmacological countermeasures. The papers in this issue are a diverse assembly; some very pharmacological in orientation, others driven by behavioral neuroscience. The unifying theme is the psychological consequences or organic syndromes that may be confused with consequences resulting from exposure to CWAs or use of their medical countermeasures.