It is a site titled To our Veterans and though it may take a moment to play the song..It plays the song..just beautifully sung. I can't link but copied it accurately I believe.
Thanks for the link, but I think that's the song they were singing, right? I was trying to get the name of the instrumental song played after they were singing, upon the exit of the casket.
They played Mansions and I believe a brief segment of the Navy Hymn.