Subject 386 (Earth-4001)

Subject 386, also known as the Groombridge Subject, was a Sangheili prisoner of war who was interrogated by Admiral Preston Cole, First Lieutenant Richard Barclay, and Solipsil. It was from Subject 386 that the United Nations Space Command first learned why the Covenant were systematically exterminating humanity. The interrogation of Subject 386 was what convinced Admiral Cole of the necessity of keeping Earth and the remaining colonies hidden, which eventually became the Cole Protocol.

Because "Subject 386" is the human designation for this Sangheili, its real name, gender, and rank are unknown, although it is presumed to be male due to the fact that female Sangheili have as far never been seen by humans. When asked its name, the Sangheili responded with a word that could not be translated, then told them humans were unworthy to hear it.

History
The history of Subject 386 is the same as his mainstream counterpart.