Which of the following positions in the incident command system must be filled at every incident?

In the incident command system (ICS), the position that must be filled at every incident is the incident commander. This role is crucial because the incident commander is responsible for the overall management of the incident response. They establish objectives, develop strategies, and ensure that resources are allocated appropriately. This position provides a central point of command that integrates all operational efforts, coordination among various teams, and ensures a unified approach to incident management.

While other roles like the liaison officer, operations officer, and planning officer may be necessary depending on the scale and complexity of the incident, the incident commander is always required to facilitate effective communication and decision-making. Their leadership ensures that all responders are working toward the same goals and are aware of safety protocols, operational tasks, and objectives during an incident.