It's an ambulance, not a clown car. It is not a bus, rescue, truck, or rig. It does not transport a lot of people, extricate people in 99% of the country, pull light loads, or pull big loads. I understand the use of "medic" since it's an important distinction between a paramedic unit and a lower unit. I do have a problem with MICU designation since it can mean multiple things (googling it brings about pages calling a MICU any sort of ambulance regardless of level, medic fly car unit, specialty care transports (neonate/peds), and medic units) and most people are not going to know what MICU stands for. Similarly, the "unit" designation is OK since it is a common radio identifier. I wouldn't use the term "unit" though if requesting another ambulance or talking to the public.