By what title of rank are the heads of the four major functional components of the ICS known?

The title of rank for the heads of the four major functional components of the Incident Command System (ICS) is "Chief." Each of these functional areas—Operations, Planning, Logistics, and Finance/Administration—is led by a Chief who holds responsibility for that respective section. This structure is designed to ensure clear command and control during emergency incidents, facilitating effective coordination and communication among the various divisions involved.

This designation of "Chief" signifies a position of authority and responsibility, aligning with the hierarchical framework of the ICS, which is established to manage incidents in a standardized way across various agencies and responding organizations. The use of "Chief" helps to maintain consistency and clarity, ensuring that all personnel understand the chain of command. The other titles, such as Manager, Director, and Officer, do not represent the official terminology used within ICS for these specific leadership roles. Therefore, while organizations may utilize these terms in different contexts, "Chief" is the correct and recognized title for those leading the major functional components in the ICS.