We do

But I was referring to Ghoulrush/Midnighters, really
IF it were about space marines i'd be screwed already, I know next to nothing about them:
OFF TOPIC - Ish.. :
They work for the imperium that is ruled by a dead, but alive emperor!? Who is really bad ass and corrupt/evil yet also the most pure/benelovent guy on earth :?
That wasn't a piss take either, that is seriously what I have pieced together from various mentions of wh 40k space marines - It's damned confusing.
I prefer the Tau background, they were barbaric, now there not, no one knows why except that the tall people (forget their names) helped them unite and they advanced faster than anyone but we again don't know why due to some wierd space storm obscuring their planet. Simpulse

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EDIT: I did once read the grey knight omnibus, but it didn't really mention the other chapters and I've actually never played wh 40k properly in my entire life :/ only warhammer fantasy and even that was years ago and I never took it seriously (e.g. didn't have a painted army or stick to the precise rules), just a monthly mess around with my friends... was good fun though, while it lasted.