Copyright to "space marine."  Shyeah, right.  Leaving out all literary uses of the phrase, simply 'cause I'm sure I'd miss a few, allow me to mention that Leslie Fish's song "Banned From Argo," recorded in 1977, ten years before 40K, mentioned Scotty out-drinking "seven space marines and a demolition crew."  So she at the very least has a prior usage to wave in GW's face.  So much for their copyright on such a basic term.

*****
I'm a very forgiving person ... on Lord Vader's terms.  "Apology accepted, Captain."