CC-U624 was a CCS-class battlecruiser that participated in the First Battle of Arcadia. It is known only by its UNSC designation. It, along with another battlecruiser, labeled CCS-U321, exited Slipspace near Arcadia on February 9th, 2531. They were immediately engaged by four UNSC ships. During the battle, U624 destroyed two UNSC vessels, the UNSC Texas and the UNSC Belfast and severely damaged the UNSC Armstrong and the UNSC Pillar of Autumn. However, CCS-U321 was caught with its shields still down and was destroyed. After the space battle, U624 moved planet-side and started deploying ground forces, quickly overwhelming the UNSC troops there.