Which of the following is NOT one of the Army information systems?

The correct choice identifies a system that does not fall under the umbrella of Army information systems. Satellite Communication Devices, while essential for communication, are more hardware-centric tools that facilitate connectivity rather than being classified strictly as information systems in the same manner as the others listed.

Army Battle Command Systems, for instance, are specifically designed to provide commanders with situational awareness and decision-making capabilities through integrated command and control functionalities. Combat Net Radios serve as vital communication tools that help in maintaining communication among units during operations, serving as information exchange channels. Similarly, Blue Force Tracker is a part of the Army's information systems that enables tracking and visibility of friendly forces using advanced technologies.

In contrast, while Satellite Communication Devices assist in enabling communication, they do not provide the integrated data processing and information management capabilities that characterize the systems mentioned in the other options. This distinction emphasizes that the primary focus of Army information systems is on data processing and operational command rather than just communication hardware.