Which statement best describes a Kill Box (KILLBX)?

• A. A restricted airspace where only friendly aircraft may operate
• B. A two-dimensional zone where CAS operations are planned
• C. A 3D permissive fire support coordination measure with an associated ACM to facilitate integration of fires
• D. A no-fire area around high-value assets

Answer: (C)

A Kill Box is a three-dimensional, permissive fire support coordination measure that creates an airspace envelope in which fires can be applied with minimal additional coordination, as long as an associated airspace control measure is in place and ROE are respected. The vertical extent is what makes it 3D, extending the plan into the sky so aircraft-delivered fires and other munitions can be coordinated with ground operations without re-planning for every target inside the box. The term “permissive” means that once the Kill Box and its ACM are active, units don’t need to obtain separate, target-by-target clearance for engagements within the box—fires are authorized within the defined constraints, provided safety and deconfliction rules are followed.

This concept isn’t about restricting to friendly aircraft or creating a simple two-dimensional zone; it’s not a no-fire area around assets. It’s specifically a dynamic, integrated airspace and fire support construct designed to speed and synchronize joint fires, with the ACM ensuring proper airspace coordination to prevent fratricide and conflicts with other airspace users.