Which of the following is NOT one of the five critical ICS functions that must be carried out on every MCI incident?

The correct answer focuses on a key aspect of the Incident Command System (ICS) and its application in managing Mass Casualty Incidents (MCI). The five critical functions of ICS essential for MCI management include Triage, Treatment, Transport, and two others that are pivotal for ensuring the efficient handling of emergency situations.

Ambulance Dispatch is not typically designated as one of the critical ICS functions during an MCI. Instead, it is more of a logistical function that falls under broader operational planning and resource management rather than a critical function required across all incidents.

In contrast, Triage and Treatment are essential for prioritizing patient care and determining levels of medical intervention needed based on the severity of conditions. Medical Communications is crucial for ensuring that information flows effectively between responders, which is vital for overall situational awareness. Therefore, understanding these critical functions allows for more effective response planning and execution during mass casualty situations.