Tokugawa Heavy Industries

From the Metal Gear Wiki

Tokugawa Heavy Industries is a company that created the exoskeletons worn by the Cyborg Ninjas.

At close inspection, the name "Tokugawa" appears on piping in Metal Gear Solid 2: Sons of Liberty in the first floor pump room of Strut A. The name also appears on boxes in Strut E's Parcel Room. In Metal Gear Solid 4: Guns of the Patriots, Raiden's helmet also bears the words 'TOKUGAWA HEAVY'.

Tokugawa Heavy Industries came from Policenauts, one of Hideo Kojima's early games. It is a reference to his early years as a designer and it is unknown whether the Tokugawa Heavy Industries from Metal Gear is the same company existing within the Policenauts and Snatcher universes.