I was a firefighter and EMT in Washington State about twenty years ago. On certain EMS calls we routinely dispatched an aid car (ambulance) and an engine to ens

I was a firefighter and EMT in Washington State about twenty years ago. On certain EMS calls we routinely dispatched an aid car (ambulance) and an engine to ensure enough crew (two from aid car, usually three on the engine) on scene to handle what might arise, such as the need for CPR, or getting a corpulent patient down a flight of stairs on a stair-chair.