Find the keystone.
The 704th Military Intelligence Brigade, a subordinate unit of the U.S. Army Intelligence and Security Command, conducts synchronized full-spectrum signals intelligence, computer network and information assurance operations directly and through the National Security Agency to satisfy national, joint, combined and Army information superiority requirements.
https://en.m.wikipedia.org/wiki/704th_Military_Intelligence_Brigade
https://upload.wikimedia.org/wikipedia/commons/9/90/704MIBdeSSI.jpg