Board Thread:General Discussion/@comment-4913740-20130628164607/@comment-4913740-20130707152651

That's the point I was leaning towards. The "cybernetic" enhancement comes from the powered suits they wear as opposed to physical enhancements on their body.A

Although perhaps some form of muscle enhancement has taken place also.

However, you point out that that Tengus bleed regular blood instead of MGRR cyborg internals and artificial blood. While that's a good point, Gray Fox however bled real blood when he fought Metal Gear REX, despite his cybernetic enhancements. Although it would make sense, seeing that the cybernetic enhancements given to Gray Fox were roughly 20 years before the cybernetic enhancements given to Raiden and the cyborgs in MGRR.

But I doubt that cybernetic surgery is even a possibility in The Phantom Pain. I think that perhaps these soldiers undergo some form on gene therapy similar to what the Genome soldiers undergo, using DNA from Big Boss to enhance their abilities, along with powered suits.