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The Second Fleet was a fleet in the UNSC Navy with unknown starship size. It participated in the Battle of Earth on November 3, 2552 and in conjunction with the Seventh and Sixteenth Fleets. The Second Fleet was engaged in major skirmishes with Covenant Navy units in Earth orbit.

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