Final answer:
Alan Brunacini highlights that 70% to 80% of the American Fire Service's work is EMS-related; the exact percentage might vary, but EMS constitutes a majority of emergency calls.
Step-by-step explanation:
According to Alan Brunacini, a significant portion of the American Fire Service is dedicated to Emergency Medical Services (EMS). While the exact percentage can vary, it is commonly understood that 70% to 80% of American Fire Service is EMS as EMS calls constitute a large majority of the total emergency responses by fire departments across the United States. It is a reflection of the modern fire service's evolution, where the scope of work has expanded beyond firefighting to include medical emergencies, hazardous materials incidents, and other public safety concerns.