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The ChoS Battle Group was a military unit within the ranks of the Klingon Empire and operated in the late 24th century.

Following the destruction of Romulus and its sisterworld of Remus due to the Hobus star, the Klingon Defense Force sent in the choS Battle Group under the command of Captain D'rakal in order to investigate the advanced technology of Nero's vessel the Narada. The expedition took the fleet into the territory of the Romulan Star Empire where the ships encountered the Forge and it was discovered that the Romulans were experimenting with Borg technology. Further probes into Romulan space led to the battle group coming under an attack from a mysterious enemy vessel and led to the fleets complete destruction.

The loss of the choS Battle Group was reported to Chancellor Martok by Quen of Klingon Intelligence. (ST website: The Path to 2409)

Bajoran guardsmen
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