I really hope this gets denied. It's way to broadly used and generic a term for someone to "own".
It's getting ridiculous the things people are trying to claim ownership of these days.
Just a reminder, to those talking about prior art:
The Space Marine table top minis game was produced in 1978 (originally).
It is neither owned by, nor licensed by, Games Workshop. I would be greatly interested if anyone has ever contacted the IP's holder or their estate re this issue.