Our protocols state we must have 2 EMT's to transport.
In some places, it's required to have 2 EMT's in order for the ambulance to go, others only require one. Do you wait a certain amount of time before you call for mutual aid? Do individual members have radios so you can confirm who is/isn't responding?
This is silly. There's no need to have an ambulance full of people zipping up and down the road. I've been doing EMS since 1992, and have operated hundreds (thousands?) of calls with only myself and one other person. Three is nice, but not required.