A suggestion for y'all to consider,
Now, I don't know about America or Europe, but in Australia, our ambulance service have paramedics with training for rescues (eg cliff rescues, sea rescues, etc.).
Thus, the first unit I am recommending is the "Special Operations" unit. We have highly skilled (and trained) paramedics that specialise in high risk and rescue operations including water rescue, cliff rescues, confined space rescues, etc. It would be great if we had missions to do with this (maybe a future update if Sebastian isn't too busy). It would make it more realistic if we had this sort of unit.
The second thing I am suggesting, is to be able to train "HEMS" paramedics to basically be the same as a special operations unit, just be faster (or could be needed in certain missions).
The third unit I am suggesting is a chief unit (or commander). These are used in medium - large scale incidents (in Australia) and could make the game more realistic. This unit could (maybe?) help medical crews finish faster (as they would be being directed by the commander).
I am aware and fully understand that A. It could be very difficult to code and B. Could be very different to everyone else's countries.
Feel free to add feedback/suggestions and thank you for taking the time to read this!
EDIT: If people like this idea, I will be more than happy to come up with some ideas for new missions related to it