I didn't immediately think "Ah. That's from [insert name]", so I'd think it was either common enough to be regarded as generic, or niche enough that no one has really claimed it as their own. (I would have reacted differently if you were asking about SPECTRE or HYDRA).
It might be that other posters here have heard of a Big Name where it's been used, but at the moment I think you're fine using it.
One thought, though : you mention "rebuilding the world", but the "N" stands for "National". Does the organisation not span the world, or is each part of the group looking at specific countries? It's entirely possible I'm seeing a problem that isn't there, but if the organsation is international, I'm unlikely to be the last person to wonder about this.