A first responder can be anyone from a by-stander to a trained professional who is able to immediately plug into the MCI cycle and take action.
Knowing and understanding the MCI cycle and what the expectations are at each component helps keep continuity in the response actions, especially as more help arrives and takes up their roles in the incident.
Being prepared in the event of a MCI is your first step in mitigating the human suffering and event process. Rescue Training Institute offers a comprehensive MCI Awareness course that is designed to develop a first responder's skills in each of the components of the MCI so that they and those who follow can plug into the cycle and expedite the scene.
Remember, the Pine Lake Tornado was an unplanned event, the summer floods in southern Alberta were an unplanned event, the next MCI will be an unplanned event too. It's not about the event, its the response that counts.