Firing control

 is a generic United Nations Space Command term for any center or position referring to the operations of weapons systems aboard a starship, such as a UNSC Frigate or Orbital Magnetic Accelerator Cannon Platform.

UNSC Starship Firing Control
For example, the Firing Control Officer, or simply Weapons Officer, aboard a frigate or destroyer is rank of Lieutenant, like Lieutenant Hikowa of the. They are in charge of Archer Missile and Magnetic Accelerator Cannon firing solutions.

Cairo Station Firing Control
Cairo Station Firing Control was the United Nations Space Command Magnetic Accelerator Cannon firing control station of Cairo Station. During the First Battle of Earth, Covenant boarders invaded Firing Control, killing the Marines (except one if you find him) stationed there and planting a impossibly large bomb (stronger than a nuclear bomb according to the cinematics)planned to destroy the orbital station, but they were repulsed by The Master Chief.