The UNSC Athens was a prowler used by ONI. In 2525, during the Spartans' infiltration mission to the Rebel base Eridanus secundus in the Eridanus system, the Athens stayed on station a few AUs distant from the base. The Athens was supposed to alert the UNSC Pioneer, should the Spartan IIs mission become critical. However, this proved to be unnecessary.
- Halo: The Fall of Reach (First appearance)