What refers to the intersection of two or more fire support plans?

The correct answer pertains to the concept of a boundary, which represents the delineation between different units, organizations, or operational zones. In the context of fire support plans, a boundary indicates where the responsibility for fire support transitions from one unit to another. This intersection is crucial for coordinating efforts among various units to ensure that fire support operations are effective and that there is no overlap that could lead to friendly fire incidents.

Boundaries are typically established to enhance situational awareness and to provide clarity in command and control, allowing different units to safely and effectively manage their respective areas of operation. By having clear boundaries, the coordination between fire support plans is improved, enabling units to understand their limits and reinforcement areas.

In contrast, other terms such as phase line, fire support area, and fire support station refer to different elements of military operations and command structures. A phase line is used to designate specific points in time or geographic locations for maneuvering units, while a fire support area refers to a designated zone where fire support units can effectively deliver fire capabilities. A fire support station is a location where fire support assets are stationed, typically for command and control, but does not delineate responsibilities in the same way a boundary does.