The Chief of Starfleet Operations was a high-ranking position at Starfleet Command on Earth. (Star Trek: The Motion Picture) The flag officer who held this position was the second-in-command of Starfleet, following the Starfleet Commander. (Star Trek: Pioneer) After Vice Admiral Leyton was arrested following his coup attempt, Lawrence Cheung was promoted to Admiral to become the interim Chief. In 2374, he was made the official Chief of Starfleet Operations. (Star Trek: Remington)