UNSC frigate operational in the 2530s.
The UNSC Tannenberg was aOn January 13, 2531, the Tannenberg was near the Groombridge 34 System where it assisted the ONI prowler Circumference in attempting to locate Spartan-051, who had gone missing in the area. It was unable to locate him, and was soon after called to action because of Covenant activity nearby.