MARine PATtern should be for Marines only. I'm not going to threaten anybody over it, but I'm sure as heck not going to run out and get some, because it is not the uniform I was issued. I'm just proud to wear the Eagle, Globe, and Anchor. It was good enough for Chesty Puller, and it's good enough for me! [;D]
If someone is wearing the Eagle, Globe, and Anchor in a respectful way, I certainly support that, even if they never served one day. If someone looks like a slob, and appears to sully the Eagle, Globe, and Anchor, I'll probably call them on it, even if they are a retired vet.
I fought like hell to be able to wear that emblem, so I may have a little more emotionally invested than the next guy.
"Keep the faith", but that doesn't mean you have to go and "get religion!"