What is the primary legal authority for military command in the United States?

Title 10 of the United States Code serves as the primary legal authority governing the organization, regulation, and management of the Armed Forces of the United States. It establishes the basic structure of military command and outlines the responsibilities and powers of various levels of command. This title encompasses a wide range of provisions that dictate how the military operates, including the roles of the President as Commander-in-Chief, the Secretary of Defense, and various service branches.

The other options, while relevant to national security and military operations, do not serve the same foundational role as Title 10. The National Security Strategy outlines the United States' overall approach to national security but does not define military command authority. The War Powers Resolution of 1973 addresses the distribution of powers in situations of military action but doesn't establish a command structure. Title 32 pertains to the National Guard and its state role, rather than overarching military command in the federal context.