This report describes the assignment from the National Board of Health and Welfare (SoS), where Swedish Defence Research Agency (FOI), together with the Public Health Agency of Sweden (Fohm), developed a training program for regional instructors in the Management of CBRN Casualties in the Emergency Department (OSA) and conducted two pilot training sessions. The report outlines the course of the work as well as the educational materials that the trained instructors receive and are encouraged to use in their local OSA training. After the first training session, certain changes were made to the materials to improve the training for the second session.