Student or Learner
In my country, there are staff members who accompany the nurse in an ambulance. Their job is to carry the injured person on a stretcher into an ambulance. They are not paramedics or nurses.
Can I call them 'ambulance attendants'?
In the U.S., we usually say EMT, which is short for emergency medical technician. We don't have a separate nurse in the ambulance. Everyone in the ambulance is either an EMT or a patient. Some EMTs are paid and some are volunteers.
Best EMT novel ever: Bringing Out the Dead. A great slice of New York life. (And death.)
In my country, two paramedics, one riding pillion, will arrive on a motorcycle at the scene of a road accident, to render first aid and do their best to help the injured victim, before an ambulance arrives. The victim would then be put in the ambulance before it rushes to the hospital.
The paramedics are necessary because an ambulance will arrive later because of traffic jams. In this way, the chances of the victims surviving are higher.
Cool! That sounds like a great job.