Rainbow Warriors

The Rainbow Warriors are a Loyalist Space Marine Chapter of unknown origin and Founding appearing in Rogue Trader (the first edition of Warhammer 40,000), as an example of a Loyalist Space Marine Chapter, but there is little mention of them in any later Warhammer 40,000 sources. Towards the end of the Rogue Trader book a Rainbow Warrior is illustrated being shot by an Adepta Sororitas. It is possible the Chapter was named after the Greenpeace ship sunk in 1985 by operatives of the French intelligence service. Due to their appearance in Rogue Trader, they are sometimes erroneously referred to as a First Founding Legion. It should also be noted that in the 5th Edition Space Marine codex, there is a map showing the locations of different Space Marine Chapters. You will see that there is one planet where in the place of a Chapter name, it says "record deleted". By looking closely, you will see that the Chapter badge is that of the Rainbow Warriors.

Chapter Colours
In the colour illustrations included in Rogue Trader the Rainbow Warriors are depicted as using blue Mark VI Power Armour with a multi-colored stripe through the center of their helmets. The Games Workshop Website also includes a Rainbow Warrior miniature in their Space Marine Chapter Gallery, depicted in the same way.

Chapter Badge
The Rainbow Warriors' Chapter badge is a white winged lightning bolt.