Who typically assumes command of an incident?

The correct choice reflects that the first officer to arrive at the scene often takes on the role of incident commander. This individual is generally tasked with quickly assessing the situation and determining the necessary actions to stabilize the incident. The rationale behind this is rooted in the principles of incident command systems, where an immediate presence on the scene allows for timely decision-making and coordination of response efforts.

While the most senior officer present may have the authority due to their rank, their arrival may come after critical initial decisions have already been required. Therefore, the first to arrive has the advantage of understanding the situation as it unfolds. An appointed incident commander prior to arrival may not apply in fast-paced, real-time scenarios where immediate action is needed, and an experienced officer, while valuable, may not be the first on the scene. Thus, designating the first responder as the incident commander ensures an effective and timely response.