It may be springing up, but it's NOT universally understood, even by "gunny" people. A couple of weeks back, I went to orientation at the shooting club I later joined, and had several of the long-term members ask me what it meant, and where I got it. "It" was one of Corriea's green hats.
Being the sort of guy I am, I had to give them the full skinny. Some recalled hearing of the event, one admitted his Greek teacher would be annoyed that he hadn't been able to translate it. At least no one got that "Oh no, another gun nut" look.