UNSC Razor's Edge
From Halopedia, the Halo wiki
Razor's Edge was a prowler operated by the UNSC in the 2530's. It was part of The Battle of New Harmony in 2537. During the battle, they managed to attatch a telemetry probe to a retreating Covenant frigate. They then followed the frigate through slipspace and discovered K7-49.
Its eventual fate is unknown.
