UNSC Athens
From Halopedia, the Halo wiki
The UNSC Athens was a prowler used by ONI. In 2525, the Athens stayed on station a few AUs distant from the Rebel base Eridanus Secundus in the Epsilon Eridani system. The Athens was supposed to alert the UNSC Pioneer, should the Spartan IIs mission go critical. However, this proved to be unnecessary.
