Which document outlines the organization and training of the Marine Corps?

The Marine Corps Manual is the key document that outlines the organization, policies, and training of the Marine Corps. This comprehensive manual serves as a foundational guide, providing detailed instructions and regulations that govern various aspects of Marine Corps operations. It ensures that all Marines are trained in accordance with established standards and procedures, promoting consistency and efficiency across the Corps. The manual encompasses not only training but also organizational structure, roles, and responsibilities, making it an essential reference for understanding how the Marine Corps functions as a unified force.

The other options do not serve the same overarching purpose. Marine Corps Order 1500.54B focuses on specific administrative aspects, while Marine Corps Regulations provide additional guidance on conduct and policies rather than the overall organization and training framework. The Joint Service Order pertains to inter-service protocols and regulations, not specifically the structure or training of the Marine Corps. Hence, the Marine Corps Manual remains the definitive resource for understanding the internal workings of the organization.