Does anyone know of an OSHA law that regulates whether a transporting ambulance is suppose to be on the fireground at all times, whether during an incident or trainings? I know of the new rehab regs that just passed and what NFPA "recommends", but I'm sure I read this somewhere before that it is an OSHA regulation that a transporting ambulance (minimum BLS) is to be on every fire scene for the entire incident. We are having a problem with our 3rd service ALS provider not wanting to stay at the incident if things get busy for their response area (they cover more than just our district) and wanting to pull their unit from the scene. I work for this service also and would like to have my ducks in a row when I present my case to them....