The Command, Control, Communications, and Computers Test Directorate at West Fort Hood, is responsible for testing the systems that will process and transmit voice, data, messaging, and video-information through networks at the tactical, operational, strategic and sustaining base levels.

Comprised of the Communications-Electronics Test Division and the Computer Systems Test Division, C4TD ensures these systems are effective, suitable, and survivable.

C4TD also maintains the Information Technology/Information Assurance Cell to support the testing of these systems so that vital information storage

Systems that the directorate tests include the Warfighter's Information System - Tactical; Joint Tactical Radio System; Joint Network Management System; Defense Travel System; Transportation Coordinators-Automated Information for Movement System II; Force XXI Brigade and Below Command and Control System; Army Airborne Command and Control System; Network Security Management System; Phoenix Super-High Frequency Tri-band Terminal; Simple Key Loader; Global Combat Support System-Army; and the Distributed Learning System.

C4TD professional testers remain on the leading edge of communication and information technology to ensure that there is "value added" to systems introduced to the Army within their mission area.