The purpose of this course is to provide refresher/sustainment training to prepare health care providers (doctors, dentists, nurses, physician assistants, nurse anesthesiologists, and independent duty corpsmen/medics) to effectively manage casualties during an all-hazards incident including those emanating from chemical, biological, radiological, or nuclear sources. This course also explains the history and current threat of CBRN use, the characteristics of threat agents, the pathophysiology and treatment of agent exposure, and the principles of management of threat agent casualties. The course is presented in accordance with the Tri-Service CBRN Medical Training Program and meets sustainment training requirements for health care providers.