__ will be the only rank to order a contra-flow response.

The chief officer is the correct answer because this rank typically holds the highest authority at the incident scene and is responsible for making critical decisions regarding resource deployment and operational strategies. The chief officer’s role includes overseeing the safety and effectiveness of the response, which encompasses the authority to order specialized tactics like a contra-flow response. This type of response often involves redirecting traffic or managing the flow of emergency vehicles in a specific way to improve operational efficiency and safety during an emergency situation.

While the lieutenant, captain, and incident commander (IC) have significant roles in managing operations, their authority is often subject to the directives of those holding the position of chief officer. The chief officer has the overarching command necessary to implement such strategies effectively, ensuring that they align with overall incident management objectives.