Some on here may want to be helpful and give you their idea of where to start, I have no idea, but I know this is bread and butter for the RBL. Professional advice is better than asking amateur internet addicts.Thank you for those it's finding the starting place that is proving difficult, as far as we know since then our father has had no contact with the military & if the other person is the same then are they likely to know anything?
Alan
Good luck with your search, certain news whether joyous or more likely sad, given the length of time, at least gives closure and satisfaction.