Matthew 16 Verse 28

Matthew 16:28 makes a declarative prophecy that, on it's face, may appear to have not been fulfilled. What did Jesus mean, and was this statement He made actually fulfilled?

Greg Sanny is from a small town in Iowa where he was active in sports.
After a stint in the US Marines he eventually made his way to Arkansas.
He became a member of the United Church of God in 2005.