What defines international law that regulates the resort to armed forces?

• A. Geneva Conventions
• B. LAW OF WAR (DOD Manual)
• C. Rules of Engagement
• D. International Law Treaties

Answer: (B)

The main idea here is the body of international law that governs when states may use force and how war is conducted. This is the law of armed conflict, often called the law of war. It covers jus ad bellum (the justification to go to war) and jus in bello (how hostilities are fought, including protections for civilians and limits on methods and means of warfare). In U.S. doctrine, this framework is encapsulated in the Law of War Manual, which translates international principles into the rules forces must follow during planning and operations.

This makes it the best choice because it directly names the overarching legal regime that regulates resort to armed force and the conduct during armed conflict. The Geneva Conventions are a foundational part of this regime, focusing on protections for people and specific wartime rules, but they are treaties within the broader law of armed conflict rather than the entire framework by themselves. Rules of Engagement are operational directives that implement the law in a specific mission context; they translate legal requirements into battlefield orders, but they aren’t the global legal doctrine itself. International Law Treaties is a broad category that includes many instruments, whereas the Law of War Manual specifies the recognized doctrine for regulating the resort to force and conduct in war.