Which term describes a three-dimensional permissive fire support coordination measure used for expeditious attacks?

The term that describes a three-dimensional permissive fire support coordination measure used for expeditious attacks is "Kill Box." A Kill Box is a designated area in which friendly forces can engage targets without the need for further coordination, providing flexibility and speed in response to threats. It is established to allow for the rapid attack of enemy forces, ensuring that the engagement does not require prior approval or communication with higher command, which can be crucial in dynamic and fluid combat situations.

This measure helps streamline operations and enhances the effectiveness of artillery or air strikes, as personnel can engage targets immediately upon identification, leading to a more responsive and cohesive operational approach in a battlefield context.