What principle permits the use of regulated force for the submission of the enemy with minimal resource expenditure?

The correct answer is rooted in the principle of Military Necessity. This principle allows for the use of force in a manner that is essential for achieving a legitimate military objective. It emphasizes the requirement to engage in actions that are necessary to accomplish a mission, while also minimizing unnecessary suffering and resource expenditure.

Military Necessity supports the idea that while military operations must affect the enemy's ability to fight, they should also adhere to ethical standards and the law of war. This principle helps ensure that actions are not only strategically sound but also justified within the broader context of military ethics.

Understanding this concept is crucial, as it balances the need for effective military action with the responsibility to conduct operations in a humane and legally compliant manner. The other options—Military Justice, Combat Efficiency, and Rules of Engagement—not only focus on different aspects of military operations but do not encapsulate the specific balance between force and resource management that Military Necessity embodies.