It is good to see these guys going home at last and get the respect and honours that they deserve.
I was told that the reason why there were so many MIA's during the Vietnam war, was because unless there was an eyes on confirmation of KIA, the officers at the time preferred to list them as MIA, as their families would get a better pension on the possibility of them being alive.
I am not sure on how true this is, but I have always believed that this sounds plausible.
The Defense POW/Missing Personnel Office (DPMO) is responsible for establishing and overseeing policies on the rescue of living Americans and the recovery of the remains of those who are missing in action from foreign battle fields.
Vision: The fullest possible accounting of those who become missing due to hostile action while pursuing U.S. national objectives abroad.
Mission: Establish the most favorable conditions and conduct operations to account for persons missing in past conflicts, and prepare to account for those who remain missing following current and future conflicts.
I spent three years in the early '90s as the SrTm Ldr and as the Ops Officer searching for POW/MIA from the Vietnam War in Indochina and from WW2 in the South Pacific. Best job I ever had. None will ever compare.