Thanks allot for the great information that you gave me. Actually nurses already work on ambulance and the crew system is of 3 ( with the nurse ). In regard chaotic situations we are use to them, although we are not aloud to do them i mean intubation, chest needles and tubes pericardiocentesis and cricothyroidotomy, etc ( as they specify that only doctors able to do them) our EAR ( emergency ambulance responders) are only trained for Basic life support and driving.