The branch of Starfleet Command that oversees the routine running and deployment of the fleet, headed at different times by Admiral James T. Kirk and by the coup-plotting Admiral Leyton.
Starfleet Operations is one of the senior divisions of Starfleet Command, responsible for the movement, assignment and readiness of ships and personnel. Its head carries the title Chief of Starfleet Operations.
In Star Trek: The Motion Picture James T. Kirk has held that post for two and a half years since the end of his five-year mission, and uses his authority to take back command of the Enterprise when V'Ger approaches Earth.
In the Deep Space Nine episodes Homefront and Paradise Lost the Chief of Starfleet Operations is Admiral Leyton, Benjamin Sisko's former captain. Leyton exploits fear of Changeling infiltration to place Earth under martial law and to seed loyal officers through the fleet, until Sisko exposes the plot and forces his resignation.