A specific boundary established by commanders prohibits effects crossing it. What is this boundary called?

The boundary that prohibits effects from crossing into specified areas is referred to as a Restrictive Fire Line. This concept is crucial in coordinating fire support while mitigating risks to friendly forces, civilians, or sensitive areas. The Restrictive Fire Line serves as a clear demarcation that directs artillery or aerial fire support to remain on one side, thereby preventing unintended engagement with forces or assets on the other side of the line.

Establishing a Restrictive Fire Line allows commanders to maintain control of the battlespace while ensuring that fire support operations do not inadvertently escalate into friendly fire incidents or cause collateral damage. This boundary is particularly essential in complex operational environments where the location of friendly troops may shift due to maneuvering or tactical engagements.

In other contexts, terms like Boundary and Phase Line refer to different operational elements that may not inherently contain the specific prohibitive nature of the effects as defined by the Restrictive Fire Line. The Coordinated Fire Line, while also a controlling measure for fire, does not signify a strict prohibition but rather a point where coordinated artillery or air-fire support can be safely engaged, allowing for more flexibility in fire missions.