What action does the first arriving unit take with respect to ICS?

• A. The first arriving unit initiating ICS
• B. Setting the organizational chart for a large department
• C. Closing the incident scene
• D. Providing all public information

Answer: (A)

The main concept is that the first arriving unit must establish command and initiate the Incident Command System. This creates a single, accountable on-scene leadership and kicks off the structured framework for managing priorities, resources, and safety. By initiating ICS, the first unit proclaims command, sets up the Incident Command Post, and begins assigning or naming initial ICS functions (such as operations, planning, and logistics) as needed to keep the response organized. This early action prevents confusion, clarifies who is in charge, and enables coordinated decision-making and communication.

Setting the organizational chart for a large department isn’t the on-scene priority; ICS is designed to be scalable to the incident, not to reorganize an entire department. Closing the incident scene happens after control is established and safety is ensured, not as the first action. Providing all public information is typically handled by the Public Information Officer once command is established and information flows are set up, not by the first arriving unit.