How do I become a Congo bush pilot?

I recently saw the National Geographic's special on Congo bush pilots, and was wondering how I would go about becoming one. I've always been interested in finding some way to use my future aeronautical skills in a philanthropic manner that would also test my abilities, and I think that might be it. Added bonus: I might even get a chance to fly a DC-3. What kinds of groups or organizations hire people to fly meds into third world countries and things like that?