many departments have units like a rescue truck and a squad.
just like how a quint is an engine and ladder truck combined. A rescue truck is a Heavy rescue and a ladder truck combined. please add this, many departments have it.
and for the Squad. many departments have them as well, they are called
"medic squad"
it does nothing but provide more manpower and assists on medical calls with the ambulance, just like a medic engine.
and the game already lets units assist on medical calls so all that would need to happen is it gets added, no calls require it, its just there to use.
Here is a picture of a medic squad