Who is responsible for establishing and expanding the ICS modular organization?

The Incident Commander is responsible for establishing and expanding the Incident Command System (ICS) modular organization. This individual is tasked with overseeing the overall response to the incident, which includes determining the necessary structure of the incident management team based on the situation, the resources available, and the emergency's complexity. The Incident Commander has the authority to integrate various functional positions within the ICS framework and can scale the organization up or down as needed to effectively manage the incident.

Essentially, the Incident Commander plays a critical leadership role, coordinating all incident operations and making strategic decisions about how to deploy resources and organize teams at the incident scene. This allows for flexible and adaptable management, ensuring that the response is efficient and organized, which is central to effective emergency management.