What do you do when memorials get old?

What do you do when your memorial or monument starts to show signs of wear? As this NY Times video shows, multiple voices are emerging on how to handle the aging of the Tomb of the Unkowns at Arlington Cemetery. This serves as a small rehearsal of the larger conversation that we will have one day about places like the WWII and Korean War Memorials or the countless 9-11 Memorials that have been constructed around the country.