UNSC Athens
From Halopedia, the Halo wiki
The UNSC Athens was a prowler used by ONI. In 2525, Athens was on station a few AUs from the rebel base on Eridanus Secundus in the Epsilon Eridani system. She was to alert the UNSC Pioneer if the Spartans' mission went awry, however this proved to be unnecessary.
A UNSC Prowler is mostly used by the 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 Spartans mission go awry, however this proved not to be necessary.