The UNSC Belfast was a ship in service with the UNSC Navy during the Human-Covenant war. It participated in the Battle of Arcadia in February 2531, along with the UNSC Pillar of Autumn, the UNSC Texas, the UNSC Armstrong, and later the UNSC Spirit of Fire. The Belfast and the other UNSC vessels, using their Magnetic Accelerator Cannons, were able to destroy a CCS-class battlecruiser, CCS-U321, which had its shields down at the time. However, the Belfast, along with the Texas, was destroyed by the other Battlecruiser present, CCS-U624.
- The UNSC Belfast is likely named after the modern-day capital of Northern Ireland, which was once a large port and ship builder which was famous for building the Titanic.
- Halo Wars (Mentioned only)