Which document outlines the responsibilities of Marines in service?

The Marine Corps Manual is the correct document that outlines the responsibilities of Marines in service. This manual serves as an essential reference for the day-to-day operations of the Marine Corps and provides comprehensive guidelines on the roles, responsibilities, and conduct expected of Marines. It encompasses a wide range of topics including command structure, discipline, and the ethical standards that Marines are expected to uphold, ensuring that they operate within the values of honor, courage, and commitment.

While the other documents mentioned hold significance in the context of military service, they do not specifically detail the responsibilities of Marines. The National Security Act of 1947 primarily established the framework for national security and defense, including the creation of the Department of Defense. The Uniform Code of Military Justice is a comprehensive set of laws governing the conduct of military personnel, but it focuses more on legal proceedings and the consequences of misconduct rather than outlining specific responsibilities. The Constitution of the United States provides the foundational legal framework for the country, including the establishment of the military, but it does not delve into the specific responsibilities assigned to individual Marines.