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 Spartans mission go awry. However, this proved to be unnecessary.
Namesake
The UNSC Athens is most likely named for the city of Athens in Greece
The UNSC Athens is believed to be briefly mentioned in Halo:Fall of Reach
