In your opinion, do you think the US did leave some living MIAs behind as prisoners because getting them back was too difficult and would have required continuing the war there?
We were told, 'officially no' and unofficially yes. Ditto with fragging and other incidents. So my opinion is just plain "yes." As to the last part of your "because," the war could not have been continued. "Frequent Wind" was, in the same manner, 'successful' if you were among those who got out, and a failure if you were among the many left behind. We assisted a couple of Vietnamese to get out in that time who are now loyal US citizens and very conservative in their outlook.