((True telepathy in humans is very, very rare however it is something all humans can be capable of after some technological....coercing, but even then it is very hard to do and it remains rare. The Vanguard ASOG Warbreed have had it forcefully awakened in them. They can and do still communicate by speaking - they have to, few other Vanguard people have telepathy - however they do use telepathy between each other on the battlefield, and it is not mechanical telepathy.
I'm gonna give you a little piece of information, just to take into account when thinking up plans:
The ASOG Warbreed aren't the only super soldiers the Vanguard possess.
Another piece of information, relating to the use of 'grey goo' nanites and also transhumanist-type technology:
The Vanguard are humanists, as strange as that may sound.
They only really use cybernetics/bionics when someone loses a limb, and that is extremely rare. Their nano-augmented bodies are far superior to anything cybernetic or bionic. They also like to stick to their roots as biological beings. They dont see any advantage to being 'transhuman'.
They also have morals. They do, sometimes, use nanite-type weapons, but it is rare. And remember, they are looking for something on this planet. A nanite weapon may destroy what they are looking for....))
EDIT: ((Update sometime later today))
EDIT2: ((The only white haired vat-born are Pandora, Ari, Elianna and Ankara. All the others have a mixture of normal human hair colours. Its to do with the type of loyalty probes put in you and various other modifications that had a side effect of changing your hair colour))