The drivers of army medical transport are drivers - pure & simple. If you are an authorised driver - you can drive a "blood box". they are considered the same as any other type of transport.
They may have medics on board - refer to previous comments re qualifications.
They are used as the ADF feel fit - Defence Act 1903, the ADF is not answerable to the states! However gentlemens agreements, MOU's etc have been developed over the years. Did you know that the operator of a military (army navy) vehicle does not require a state drivers licence? And the ADF is not required to pay state taxes/tolls (think registration).The ADF does not need the ok from the states! However nice idea to "consult" saves problems for the GG!
I'm not sure what the point of your questions are?
However I'm sure if you would like to know more, the services are always on the lookout for the right type of people to fill their ranks! Bearing in mind recruit course prior to any other course you may consider! As for flashing lights - really?
Does it really matter?
I hope I have cleared up your questions (by the way ADF compared to ST Johns? Chalk and cheese).
In closing a "field medic" is not a first aider (as one so politely put it one day - her job is to put my parts into a body bag when I f**k up! So they are the second line in medical treatment (all soldiers are trained to senior first aid sucking chest wounds etc).
I hope that answers your questions, If not contact one of the field ambulance units I'm sure they will help (& maybe offer you are job?)
cheers