I'm RG color blind, which is the most common kind of color blindness in males (something like 6%) but rare in females. (less than 1%) The best way to describe it is to say I'm "green weak".
Greens at dusk or dark greens look black to me. I had a jacket when I was younger that I thought was black for years, it wasn't until I casually mentioned I picked it out to be black on purpose in front of my friends that they all informed me it was actually a dark (but obviously) green, not black.
I see lighter greens as green and reds as reds. But if you mix them up it becomes hard for me to separate them, ala the shirt in that other thread, or RG colorblind charts.
Really, this "lost in the mix" effect probably has never affected my life at all. Seeing dark greens as black or green cars (or whatever) as black in low light is noticeable, though.
Anyway, I'm better at seeing camouflage than a normal person, so that's something.