Alternate Care Sites (ACS) are recommended by the federal and state governments which are to be planned and implemented by the local health department. The County of Orange Health Care Agency has a Disaster Medical Shelter (DMS) Plan which is a part of the ACS. A major essential component of an ACS is the care given in the shelter. This project is to provide training to Health Care Agency and Medical Reserve Corp nurses to work in a DMS via a disaster exercise. Nurses require ongoing education and competencies. Assessment of nursing educational needs was performed. Exercise development was based on the assessment. Collaboration with community partners and educators was established. Evaluation was done using matching pre- and post-test, exercise evaluations and hotwash. All techniques demonstrated learning had occurred which was statistically significant; the exercise was well developed and organized; and recommendations were identified for future planning and exercises.