The black & white bumper stickers w/ the POW/MIA logo & inscription: Not Forgotten are commonplace. A far more concrete commitment is an effort to fulfill this promise. There's a funeral for a US soldier next week at Fort Snelling National Cemetery (like Arlington, but in Minnesota). He was MIA in 1950 in Korea.
A while ago the identification was made of the Vietnam soldier buried at the Tomb of the Unknown at Arlington. It was questioned whether or not we could have such a monument in the future, due to the marvel of DNA identification testing. I suppose we would be better off being able to de-commission it. Ideally, because we weren't killing our fellow citizens; but at a minimum, because no one was left in the limbo of anonymity.
4 hours ago