I seem to recall (and I could be wrong, this was a while ago.) that the haven alpha had red and blue colored combine that stood out quite nicely in most lighting conditions, making for a very nice change from the dark, difficult to distinguish colors of the original HL2 skins.
I realize you're probably not too keen on changing the models at this point, but I think this topic has some merit to it, as there are definitely situations where you can't tell who's who when you'd like to.
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