No, they're not Rainbow Warriors
had implanted the idea of this in my brain some time ago, but it took Apocalypto and a couple other images on dA to get me to do it XD
I haven't come up with a name for them yet, but they not exactly Astartes and not exactly Renegades. Most of their weapons are poisonous and the majority are directed toward close combat, kinda like the Space Wolves. Their emblem is that fanged skull with the snake in its mouth.
I might expand moar on these guys in the future.
Mayan Marine design © me
Music: Warriors of the World United - Man-o-war