The State of Texas does not require a person to have a special liscense to drive an Ambulance. A Simple "Class C" or normal non-commercial drivers liscense is sufficient.
The State of Texas does not require a special permit to drive a Fire Apparattus EMERGENCY TRAFFIC TO A CALL
But does require that a CDL be possessed by anyone driving a Fire Apparattus in any non-emergency capacity.
-------------------
My Fire Dept. I was with for 10 years had strict driving policies. All E/O's had to be a Firefighter in good standing, and off probation for a time of no less than one calendar year after the end of his/her probation, and/or one full calendar year since his/her last disciplinary action.
The E/O candidate then must have endorsement from their leiutenant, capt, Sr. Capt, and Dist. Chief. At this point the E/O candidate must obtain their "Class B" CDL learners permit from the TX dept. of public safety. The E/O candidate enters a training program where they will drive the apparattus under specified conditions ( daytime non-emergency, nightime non-emergency, daytime emergency, nighttime emergency, rain, wind, heavy traffic, etc.) The E/O candidate must demonstrate their driving proficiency on each type of apparattus the dept. operates (engine, ladder, booster, tanker, heavy rescue, rehab, squad)
After the candidate shows proficiency in driving with his/her appointed FTO. They must demonstrate hands on proficiency, and written proficiency by means of exam in the Pump operations of each vehicle.
The dept. guidlines basically follow the TX Commision on Fire Protection standards, and the process usually takes 6-8 months to continue. Once completed, the newly appointed E/O is then on probation for a period of no less than 90 days. and must recertify with the dept. Each year via written exam, and every other year via hands on offensive and defensive obstacal, and pumping courses.