Sixteenth Fleet

From Halopedia, the Halo wiki

The Sixteenth Fleet was a United Nations Space Command starship fleet of unknown size.

It participated in the Second Battle of Earth on November 3, 2552, and, in conjunction with the Seventh and Second Fleets, was engaged in major skirmishes with the Covenant fleet in Earth orbit.

It was mentioned by Sergeant Laura "Smokes" Tanner, while piloting Blue Team to the Centennial Orbital Elevator.