an ambulance usually has two crew members. that way, one can drive while the other looks after the patient in the back. a "paramedic" will have at least a year of medical training, and can do fairly advanced treatment. not all ambulance staff are paramedics. those with less training are known as "emergency medical technicians" (emts) in some countries such as the united states, and "emergency care assistants" (ecas) in the united kingdom. in some countries such as france, germany, the netherlands and sweden, ambulances may have doctors or nurses on board.