Based on true story - anyone know the background?

I love this Men with Guns...it was a haunting movie and I understand it's based on a true story where young doctors were sent out to villages on a government-sponsored program, but tragically they perished at the hands of the military. By any chance does anyone know anything about the real-life doctors who were sent out? I think a documentary or a movie focusing on these doctors (as opposed to the search for them) would be something to watch.