The Soldier wrote:
Green and Brown are just painful to tell apart. A very light tan in place of Brown would be fine IMO, as Grey and Green are pretty nicely set apart.
And this is coming from a red-green colorblind person, so it's accurate.

Already covered, as mentioned in IRC earlier, thanks for the help.
Updating OP in a couple moments.
DoomMetal wrote:
Would having differently patterned uniforms be a good idea for this?
Like one faction would have single color uniforms, another could have different colored jackets and pants, a third could have... stripes?

It would perhaps look strange, but at least it would be very easy to tell them apart which is kinda the point here.
As it is I was going for some large variance in shade. I wanted one faction to Glow, one to perhaps seem darker, and one be a more moderate shade. I still can mess around with some things, but right now Blue (Grey) is darkest, Green is Moderate, and Tan is now Honey-Mustard yellow.