Also, I may have joined in 2016, but I’ve been following this site since I think 2013, maybe 2012 at the earliest.
There was never any agreement between the U.S. and NK to release any POW's despite what you may have read in your history books.
The Paris Peace accords signed in 1973 stated that the VC would release all of our POW's but they never did, thus insuring the U.S. wouldn't resume military action against them.
Your Maverick John McCain knew this since he was a member of the Senate Select Committee on POW/MIA Affairs and blocked every effort to make this information available to the public.........