Which factor is considered the "bread and butter" of the military according to Title 10?

The term "bread and butter" in the context of military operations as defined by Title 10 refers to the legal authority for operations. Title 10 of the United States Code outlines the role of the Armed Forces, specifying the organization, training, and operational mandates that guide military conduct. This legal authority provides the foundational framework that allows military operations to be conducted effectively and within the bounds of the law.

Understanding the importance of legal authority is crucial for military personnel, as it ensures that all actions taken by the military are sanctioned by law, maintaining accountability and integrity in operations. Without this legal framework, military actions could lack legitimacy, and strategic initiatives could be undermined by legal challenges or diplomatic consequences. Thus, legal authority serves as the fundamental underpinning that governs all aspects of military function, making it the "bread and butter" of military operations.