Overview
Several NATO countries have collectively organized an elite counterterrorist unit, composed of the best soldiers from the militaries of several nations, named Rainbow. Based in Hereford, England (real-life home of the Special Air Service), the team is led by John Clark (who had the idea for Rainbow), a recurring character in Clancy's novels. Rainbow is "blacker than black," its American funding directed through the U.S. Interior Department by the U.S. Congress, then through the Pentagon's Office of Special Projects, with no connection whatsoever to the Intelligence Community. Fewer than a hundred people in Washington, D.C. know that Rainbow exists.
Read more about this topic: Rainbow Six (novel)