The Bezirkskrankenhaus (regional hospital) Heinrich Braun in Zwickau, Saxony, operates professional emergency medical services, using a variety of vehicles. Here is a selection from the days of the German Democratic Republic:
Krankentransportwagen – Ambulances
Rettungswagen – Emergency Ambulances
Leiter vom Dienst – Commanding Officer on Call
Please note that these are scans of old 35mm slides from my archives, with resultant deterioration in colours and sharpness.