Which of the following is NOT one of the war-gaming methods utilized?

The correct choice indicates that "Circle" is not recognized as one of the conventional war-gaming methods used in military planning.

In the context of the MDMP, war-gaming methods are structured approaches employed to understand and evaluate the potential courses of action and their implications during military operations. Each of the recognized methods, such as Belt, Avenue-in-Depth, and Box, serves specific strategic purposes and helps to analyze situations from various perspectives.

For instance, the Belt method typically focuses on a linear area of operations, assessing how forces can maneuver within a defined corridor. The Avenue-in-Depth method analyzes movement along a path that extends deep into enemy territory, considering the depth of actions and resources. The Box method allows for an evaluation of operations within defined operational boundaries, providing a focused assessment area for planning.

Since "Circle" lacks established usage or definition in these contexts, it stands out as the method that does not fit within the recognized framework used during the MDMP. Understanding the context and purpose of the remaining methods allows you to appreciate why "Circle" does not belong to the list of war-gaming methods.