Gamma Station
From Halopedia, the Halo wiki
Summary
Reach Station Gamma was essentially a ring, three kilometers in diameter. Docking bays and communications dishes covered the surface of the station, located in orbit around the planet. It was run by a Dockmaster AI named Doppler.
In 2552, during The Battle of Reach, three Spartans, SPARTAN-117, SPARTAN-058, and Spartan-James took a Pelican to Reach Station Gamma. An ONI Prowler, the Circumference, docked in the station had failed to Delete its NAV database. Covenant intrusion software had detected the unsecured database and three Covenant frigates were sent to secure the data. Those frigates were destroyed by MAC rounds from the Planet's orbital guns, as well as firepower from the UNSC Pillar of Autumn, but not before they dispatched Elite and Jackal rangers to secure the data. Eventually, Spartan-117 was able to destroy the database but both Spartan-058 (Linda) and James were casualties.
After the UNSC retreated from Reach, Covenant ships destroyed the station along with everything else in sight, when they glassed the planet.