Joint Worldwide Intelligence Communications System

Definition
The Joint Worldwide Intelligence Communications System (JWICS) is

"[t]he sensitive, compartmented information portion of the Defense Information Systems Network. It incorporates advanced networking technologies that permit point-to-point or multipoint information exchange involving voice, text, graphics, data, and video teleconferencing."

Source

 * U.S. Department of Defense, Joint Pub. 1–02: DOD Dictionary of Military and Associated Terms (Apr. 2010) (full-text).