William T. Riker is a reputed Starfleet officer, who was widely known for his role as executive officer of the Excelsior-class USS Hood, the Galaxy-class Battleship USS Enterprise-D and the Sovereign-class Battleship USS Enterprise-E and likewise became famous for commanding the Luna-class USS Titan. As of 2385, he is the commanding officer of the USS Paladin and the Flag Officer-in-Command of Task Force Paladin, which is attached to Vanguard Fleet and Vanguard Command.