Final answer:
The Defense Planning Guidance defines the planning scenarios used to size and shape the military.
Step-by-step explanation:
The Defense Planning Guidance is a document that outlines the U.S. Department of Defense's long-term plans, strategies, and priorities. It provides guidance on how to size and shape the military forces to meet future challenges. The planning scenarios mentioned in the question refer to the hypothetical situations that are used to assess the military's capabilities and determine the necessary resources.
For example, one planning scenario could involve a potential conflict with a hostile nation or a humanitarian crisis requiring military intervention. By analyzing these scenarios, the military can identify the capabilities and resources needed to effectively respond to different types of threats.
Therefore, the statement in the question is true: the Defense Planning Guidance does define the planning scenarios used to size and shape the military.