[quote=TreueKaiserin]
Actually, I think it's steel/steel, which is basically black/black, and they say "Special forces black armor" So if it wasn't steel/steel, it would be black/black.
[/quote]No it's Black/Steel.

[img]http://img1.wikia.nocookie.net/__cb20121112010902/rvb/images/8/8a/Tex_-_S5.png[/img]
There is clearly the black underlay with an obvious not black outer layer.

It could never be black/black. I wouldn't call the outer layer steel myself but that is what RT calls it which I am assuming is what Halo called it.