Battalions AOR is referred to as what?

The term that best refers to a battalion's Area of Responsibility (AOR) is "Area." In military terminology, an Area is specifically designated to a unit and encompasses the geographic space within which that unit operates and is responsible for carrying out its mission. It defines the boundaries within which the battalion is tasked to conduct operations, provide security, and support other units, making it a critical concept for organizational planning and execution.

In other contexts, while "Sector" and "Zone" can also refer to designated operational areas, they are generally used at different echelons or for specific types of operations, such as sectors for larger formations or zones for particular tasks or control measures. Conversely, "Outpost" refers to a specific location or forward position rather than the overall area assigned to a battalion, leading to it being less precise in this context. Thus, "Area" is the most suitable term for defining a battalion’s AOR.