Why does a fire engine respond when I call for an ambulance?

It is department policy to send at least one vehicle on all life threatening calls; heart attacks, trouble breathing, possible strokes, vehicle accidents, etc. The vehicle may be an engine, MED (medical truck), or heavy rescue vehicle, depending on the type of call. The personnel on these vehicles do patient assessments, basic emergency medical treatment, and assist the ambulance crew. Personnel on these companies are New York State Certified First Responders, Emergency Medical Technicians, or Paramedics.