Unidentified Navy captain (Reach)

The Unnamed Navy Captain is seen only in Halo: The Fall of Reach. He, at the request of Dr Catherine Elizabeth Halsey, upgraded John-117's neural interface to become compatible with Cortana.

When John first saw him devoid of an insignia, he became uncomfortable, but relaxed after the Captain told identified himself. The Captain was never mentioned afterward. It is assumed he was killed when the Covenant glassed Reach the day afterward.