Which measure represents a fixed line that assists in maneuver operations?

A phase line is a crucial reference in military operations that denotes a predetermined line across the terrain. It serves as a guide for maneuver units to coordinate their movements and operations. By using a phase line, commanders can effectively direct their forces, facilitate communication, and promote synchronization between units. This ensures that all elements have a common point of reference, allowing for coordinated actions during offensive or defensive maneuvers. Phase lines help establish a clear framework for combat operations, enhancing situational awareness and operational effectiveness on the battlefield.

In contrast, a fire support area is designated for the concentration of fire support assets but does not primarily serve as a guide for maneuver. A boundary is used to define areas of responsibility between units but does not function as a fixed line for maneuver operations. Similarly, a fire support station refers to a specific location where fire support systems are positioned, which is not the same as a phase line's role in assisting maneuvering troops.