Don't give up.
Read my post a little more carefully. In Ca. you are required to have an "Ambulance Driver License" to operate an ambulance. It is simply an endorsement to go along w/ your class C license. To get that endorsement, you have to have a current green card, or DOT physical. (DMV form DL 51A).
http://www.dmv.ca.gov/dl/driversafety/cdl_guidelines.htm#PageTop
From the DMV web site:
Insulin-Dependent Diabetes-
The driver is qualified if: He/she has no established medical history or clinical diagnosis of diabetes mellitus currently requiring insulin for control.
Exceptions/Considerations: The commercial driver generally is not in a position to balance dietary and rest needs. Injury, emotional stress, unrelated illness, diarrhea, vomiting, or infection may also affect control of the diabetic condition.
Additionally, residual effects of the disease may include nerve and vascular damage causing pain or numbness in the extremities and/or vision deterioration. When evaluating the condition of any diabetic, residual effects of the disease should not be overlooked. Diabetics who are well controlled with diet or oral medication usually do not pose a problem for the issuing of a commercial license. However, they too may be subject to these residual effects.
Thorough review of the entries for vision and extremities on the medical report and urinalysis is required. Indications from urinalysis of uncontrolled diabetes may disqualify an applicant from operating a commercial vehicle.
For the above stated reasons, the circumstances in which an insulin dependent diabetic may be qualified for a restricted intrastate commercial license will be very rare.
Under federal standards, a diabetic on insulin therapy, regardless of the degree of control, does not qualify for interstate driving, unless they were issued a federal waiver or exemption.
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Other things that could preclude you from obtaining a DL 51A is Loss of or Limited Use of Extremities, severe cardiac issues, severe respiratory issues, uncontrolled High B/P, Seizure disorders, etc.
Like I said, I'm sure theres ways around it. Request a DMV hearing if you are denied. Research the exceptions and see if your case is unique. If you want this job, you'll get it. Don't think it will be handed to you, but it's well worth the hard work.
I may not be rich, but I still look forward to coming back to work each and every week. I enjoy what I do, and that means less stress at work, less stress at home. I work 48/96. 96!!!! 4 days off, every week!!! I can get in a lot of fishing in 4 days.
Best of luck to you, and don't be deterred. Anything worth having is worth fighting for.