Rule #22: Never, ever bother Gibbs in interrogation.
The victim is supposedly a sailor from a fictitious destroyer "DD-350 Hagen". The actual DD-350 was the destroyer USS Hull, launched in January 1934 and foundered in a storm December 18, 1944. There has never been a USS Hagen, and the ship shown in the establishing shot before they interview the victim's shipmates is in fact not a destroyer but the battleship USS New Jersey (BB-62), now a museum ship in Camden, New Jersey.