While serving as an Intel Specialist with the USAF in Nam, we used Vietnamese Army Interpreters to debrief Chieu Hoi (Open Arms) Returnees; those who gave up and sought clemency and were housed in camps.
Though I spoke French and some Vietnamese, we used these Interpreters as we wanted to get the best Intel possible...and we did develop some good stuff from some of them.
After 18 months we got to know them pretty well and developed and fairly close relationship, thus after we bugged out, all of those who "collaborated" with the eeeevil US Forces were targeted for arrest, imprisonment or worse.
I often wondered what happened to the handful I knew as well as the thousands of others who made the mistake of "trusting" us and believed we would not cut and run and leave them holding the short end of the stick!