Vote for ACO for National Film Registry
It should be there
https://www.loc.gov/programs/national-film-preservation-board/film-registry/nominate/
I voted for ACO, along with Barry Lyndon, Straw Dogs, and The Man Who Would Be King.
I would have voted for more but I'm at work now and don't have time to look through all the titles.
Mustard goes on Hot Dogs. Mayo goes on Burgers. There will be no compromise on this.