Soviet bionics engineer

The Soviet bionics engineer was the original creator of Venom Snake's prosthetic hand. In 1984, he unsuccessfully tried to defect from the Afghanistan base camp. He was captured and brought to Wakh Sind Barracks as a prisoner. He was rescued by Venom Snake and recruited into the R&D department of Diamond Dogs. He continued to work on the prosthetic hand, modifying it for Snake. It is suggested by Miller that he might've been working on a secret Soviet weapon in Afghanistan.

Behind the scenes
The bionics engineer is a key character in the main mission "Over the Fence" for Metal Gear Solid V: The Phantom Pain. He seems to be the only playable character in the game to wear glasses.