
Specifically, where do they come from, what's their story - and I mostly don't mean their in-game story. I mean, how were they made, and why do they look so different to the other humanoid sprites in the game?
They look as if they may be photos of models like the other sprites are but they are far less cleaned up and spritey-looking. They are very "noisy" and a quite different style to almost every other graphic in the game. Also, there are other stylistic differences; their clothes, for example, show lots of folds and creases in a way that the clothes on other sprites do not.
To me, they have always been meant to loo like former marines, but, honestly, looking at them, that could be entirely wrong. I guess my main reason for thinking that is that the other unfortunate tortured guys definitely look like marines.

But they have been cleaned up and match the other sprites.
So, what gives? Anyone know?