What is the Army's strategic, theater and tactical command, control, and communications system?

The Army's strategic, theater, and tactical command, control, and communications system is known as GCCS-A, which stands for Global Command and Control System-Army. GCCS-A is designed to provide a robust framework for operational command and control, facilitating the exchange of information and enabling more effective decision-making across various levels of military operations.

By integrating data from different sources, GCCS-A supports situational awareness and enhances the Army's ability to coordinate with other branches and allied forces. This system is crucial in ensuring that command decisions are based on timely and accurate information, thus improving operational effectiveness in dynamic environments.

The other choices, while important in their respective contexts, do not serve the same broad scope that GCCS-A does in terms of providing a comprehensive command and control capability across strategic, theater, and tactical operations.