Which system provides support for the coordination of logistics across military branches?

The correct choice highlights the Global Combat Support System-Army (GCSS-Army) as a vital tool for coordinating logistics across military branches. This system integrates various logistical functions and operations within the Army, enabling effective supply chain management and support.

GCSS-Army facilitates the real-time flow of information about resources, assets, and supplies, which is crucial for joint operations where multiple military branches need to work together efficiently. The system enhances visibility into inventory levels, improves maintenance management, and streamlines the logistical process, allowing for rapid response times and informed decision-making during military operations.

In contrast, while the other options provide important functionalities within their specific domains, they do not encompass the broad logistical coordination across all military branches as effectively as GCSS-Army does. For example, the Joint Logistics System (JLS) may focus on enhancing joint logistics, but GCSS-Army offers more comprehensive support tailored specifically for Army operations, which is essential for the overall coordination effort in joint environments.