What action is taken by the first arriving Chief Officer?

The action taken by the first arriving Chief Officer is to assume command. This is a critical step in the incident command system (ICS), as the Chief Officer is responsible for the overall management of the incident scene. By taking command, the Chief Officer can establish a clear chain of command, ensure effective communication among responding units, and make tactical decisions based on the initial assessment of the situation.

Once command is assumed, the Chief Officer can then delegate specific tasks to other responding personnel, coordinate resources, and implement strategies to address the incident effectively. This initial leadership is vital for maintaining order and ensuring that all responders work efficiently towards a common goal, improving response times and outcomes.

While actions such as initiating Level II staging, establishing a staging area, or conducting an assessment may also occur, they are typically secondary to the primary responsibility of assuming command. This foundational step sets the stage for all subsequent operations and supports effective incident management.