This text explains and synthesizes the functioning and relationships of numerous Defense, Joint, and Army organizations, systms, and processes involved in the development and sustainment of trained and ready forces for the Combatant Commanders. It is designed to be used by the faculty and students at the U.S. Army War College (as well as other training and educational institutions) as they improve their knowledge and understanding of "How the Army Runs." We are proud of the value that senior commanders and staffs place in this text and are pleased to continue to provide this reference. The text is revised every two years as we strive to capture the most up-to-date information available. This involves the synthesis of a wide array of published and unpublished references from a variety of sources. Necessarily, there is a point in time at which updates must stop. This volume contains our best description of the systems, processes, and organizations as of March 2015