在MGS2的最初企划案中,对emma有如下描述*
Emma Emmerich (EE)
Participated in Arsenal Gear's development. Otacon’s younger sister. Supports Raiden via Codec. [B]An employee of Tokugawa Heavy Industries[/B] , she was in charge of developing Metal Gear Arsenal’s AI and PAL safety device.
据此,04猜测雷电的忍者服/外骨骼植入是由TOKUGAWA HEAVY INDUSTORY(德川重工)提供/实施的。
考虑到Private Military Companies是MGS4的一大要素,那么TOKUGAWA HEAVY INDUSTORY(德川重工)可能就是PMC之一。