The Korean War was our very first in which we encountered unusually large numbers of missing (and yes, it was a war - politicians, most of whom were lawyers, officially dubbed it a "conflict" or "police action" partly from a need for legal correctness but mainly to conceal the totally illegal, unconstitutional nature of the entire situation). This is due largely to the fact that North Koreans and Red Chinese were our first opponents to intentionally remove - and conceal - bodies, ours and theirs, from battle sites. The North Vietnamese and Viet Cong did the same thing, howbeit to a greater extent. POW's very often were held for long periods prior to their captivity being reported and many were never reported at all. This served little, if any, tactical purpose but the psychological effect has been pervasive. A great many still grieve in anguish for family members who disappeared years ago and many more have gone to their graves without the slightest intimation of what became of their loved ones. This may not have been the Communists' intent but end result is the same, intentional or not.
One of the most unfortunate facets of it is that all who profited most - politicians, defense contractors, professional military, even the communists - have made all there is to be made from it and it's been effectively forgotten. Likewise Vietnam. Sadder still is the fact that so many who should be demanding accountability - in this as well as many other matters large and small - from an increasingly high-handed, insensitive government - and society - are instead devoting valuable time and resources to such meaningless symbolism as monuments and memorials. Unfortunately, your Dad will probably remain nothing more than a name inscribed on a stone and that, too, will be forgotten as you and your succeeding generations pass from the scene.