This United States Marine Corps USMC manual, Marine Corps Doctrine Publication MCDP 4 Logistics March 2023, describes the theory and philosophy of military logistics as practiced by the United States Marine Corps. It provides Marines a conceptual framework for understanding how logistics is an essential aspect of every military operation. It includes chapters on The Nature of Logistics, The Theory of Logistics, The Logistics Enterprise, Logistics Preparation, and Logistics Planning and Execution.