Effective emergency medical services (EMS) scene management contributes to the success of the response and mitigation phases. Management of large and sustained incidents is structured around command and general staff in association with geographical divisions, functional branches, and groups. Command and general staff consist of an incident commander or a unified command when multiple disciplines are needed to manage the incident. Reporting to the incident commander is the general staff: operations section chief, plans section chief, logistics section chief, and finance/administration section chief. To manage a multicasualty incident site, initial responders should establish an incident command system and appoint an incident commander and personnel to function as triage unit leader and medical communications coordinator. These essential three functions meet the initial needs of organizing resources, assessing the incident, reporting conditions and hazards (scene safety), requesting additional resources, initiating victim triage, and establishing communications with the EMS and healthcare infrastructure.