Jason Gerard Young, 21, disappeared from Concord, California, on January 26, 1999. A U.S. Navy sailor assigned to the USNS Flint at Pier 4, he was last seen returning to the Concord Naval Weapons Station by taxi in the early morning hours. Shortly afterward his jacket — containing his cellphone and a pocket watch — was recovered entangled on a pylon of the pier, but there has been no confirmed trace of him since.

Jason had brown hair, hazel eyes, a tiger’s head tattoo on his right forearm and a large mole on his arm. The Naval Criminal Investigative Service has investigated the disappearance and the case is listed in NamUs as MP53709, but it remains unsolved.

If anyone was at or near the Concord Naval Weapons Station that night or has information about Jason’s movements or the jacket found on the pier, please share what is known with investigators.