(1) A basic life support ground ambulance service must ensure that at least two of the following individuals are on board the ambulance when a patient is loaded or transported, with the proviso that having only two EMT-Fs with ambulance endorsements on a call is not allowed:

(a) a grandfathered person certified in advanced first aid;

(b) an EMT-basic equivalent; or

(c) a physician.

(2) A basic life support ambulance service may be authorized as provided in ARM 37.104.320 to provide on some calls, based on personnel availability, a higher level of care than that for which it is licensed.