The ship portraying the fictional destroyer USS Sheppard (the one docked at Norfolk) appears to be an old Knox-class frigate, likely the USS Harold E. Holt (FF-1074). Footage of the Holt at sea was used in a few previous episodes, and she was decommissioned and in dock at the time of this episode's filming, a lot of the interior shots of Navy ships in this series are filmed onboard decommissioned ships in the mothball (reserve) fleet. The Holt was decommissioned in July of 1992, a number of shows and movies used the Holt's corridors and rooms as filming locations for various fictional warships over the 10 years she sat in reserve. The Holt's final fate was to be used as a target ship in a live-fire joint training exercise between the US Navy, Royal Australian Navy, Royal Canadian Navy and the Japanese Maritime Self-Defense Force; she was sunk in the Pacific on July 10, 2002 after being struck by several anti-ship missiles and torpedoes.