Summarizes the results of an analysis of available data sources concerning the hazards facing firefighters, police, and emergency medical responders. Collects and synthesizes available data on casualties experienced by the emergency responder population. The authors examined data separately for firefighters, police officers, and emergency medical technicians. These data can provide a route for identifying combinations of kinds and causes of injury, body parts involved, and types of responder activity where injury reduction efforts might be most effectively applied.