From Halopedia, the Halo wiki
UNSC Sabre engineering facilities is a section of the orbital refit stations used by the United Nations Space Command. Their primary purpose is to construct and repair YSS-1000 "Sabre"-class starfighters. One such facility forms the setting for the Halo: Reach multiplayer level Anchor 9.
Another view of the interior.
View outside a Sabre repair bay.