What maneuver control measure helps coordinate military operations?

A Phase Line is a specific maneuver control measure used in military operations to coordinate movements and actions. It serves as a reference point on the battlefield, allowing units to synchronize their operations effectively. When troops and assets reach a designated Phase Line, it signifies a critical checkpoint that can facilitate communication and enhance situational awareness among different units operating in the same area.

The use of Phase Lines helps in organizing the flow of operations by providing commanders with clear markers for timing and coordination of activities. This is particularly important in dynamic situations where rapid adjustments may be required due to changes in the operational environment. By establishing these lines, military forces can maintain effective command and control, ensuring all elements are aligned and working towards the same strategic objectives.

Other choices like Fire Support Areas, Boundaries, and Fire Support Stations serve specific purposes in fire support coordination and area delineation but do not serve the same broad coordination function across all military operations as Phase Lines do.