This field manual/Marine Corps warfighting publication establishes doctrine (fundamental principles) for military operations in a counterinsurgency (COIN) environment. It is based on lessons learned from previous counterinsurgencies and contemporary operations. It is also based on existing interim doctrine and doctrine recently developed. Counterinsurgency operations generally have been neglected in broader American military doctrine and national security policies since the end of the Vietnam War over 30 years ago. This manual is designed to reverse that trend. It is also designed to merge traditional approaches to COIN with the realities of a new international arena shaped by technological advances, globalization, and the spread of extremist ideologies-some of them claiming the authority of a religious faith. The manual begins with a description of insurgencies and counterinsurgencies. The first chapter includes a set of principles and imperatives necessary for successful COIN operations. Chapter 2 discusses nonmilitary organizations commonly involved in COIN operations and principles for integrating military and civilian activities. Chapter 3 addresses aspects of intelligence specific to COIN operations. The next two chapters discuss the design and execution of those operations. Developing host-nation security forces, an essential aspect of successful COIN operations, is the subject of chapter 6. Leadership and ethical concerns are addressed in chapter 7. Chapter 8, which concerns sustainment of COIN operations, concludes the basic manual. The appendixes contain useful supplemental information. Appendix A discusses factors to consider during the planning, preparation, execution, and assessment of a COIN operation. Appendixes B and C contain supplemental intelligence information. Appendix D addresses legal concerns. Appendix E describes the role of airpower. Doctrine by definition is broad in scope and involves principles, tactics, techniques, and procedures applicable worldwide. Thus, this publication is not focused on any region or country and is not intended to be a standalone reference. Users should assess information from other sources to help them decide how to apply the doctrine in this publication to the specific circumstances facing them. The primary audience for this manual is leaders and planners at the battalion level and above. This manual applies to the United States Marine Corps, the Active Army, the Army National Guard/Army National Guard of the United States, and the United States Army Reserve unless otherwise stated.

Part one, the "Strategic and Operational Context," provides a framework for understanding the environment where a counterinsurgency exists. Part one consists of chapters one through three. Part two, "Insurgencies," provides a doctrinal framework for understanding an insurgency. Part two consists of chapters four and five. Part three, "Counterinsurgencies," describes how to plan and execute operations to enable a host nation to defeat an insurgency.

This field manual establishes doctrine (fundamental principles) for tactical counterinsurgency (COIN) operations at the company, battalion, and brigade level. It is based on lessons learned from historic counterinsurgencies and current operations. This manual continues the efforts of FM 3-24, Counterinsurgency, in combining the historic approaches to COIN with the realities of today's operational environment (OE)-an environment modified by a population explosion, urbanization, globalization, technology, the spread of religious fundamentalism, resource demand, climate change and natural disasters, and proliferation of weapons of mass destruction. This manual is generic in its geographic focus and should be used with other doctrinal sources.

This field manual establishes doctrine for military operations in a counterinsurgency (COIN) environment. It is based on lessons learned from previous counterinsurgencies and contemporary operations. It is also based on existing interim doctrine and doctrine recently developed. Counterinsurgency operations generally have been neglected in broader American military doctrine and national security policies since the end of the Vietnam War over 40 years ago. This manual is designed to reverse that trend. It is also designed to merge traditional approaches to COIN with the realities of a new international arena shaped by technological advances, globalization, and the spread of extremist ideologies--some of them claiming the authority of a religious faith. This is a comprehensive manual that details every aspect of a successful COIN operation from intelligence to leadership to diplomacy. It also includes several useful appendices that provide important supplementary material.

This manual provides guidance for the organization, planning, and conduct of the full range of military operations on urbanized terrain. This publication was prepared primarily for commanders, staffs, and subordinate leaders down to the squad and fire team level. It is written from a Marine air-ground task force perspective, with emphasis on the ground combat element as the most likely supported element in that environment. It provides the level of detailed information that supports the complexities of planning, preparing for, and executing small-unit combat operations on urbanized terrain. It also provides historical and environmental information that supports planning and training for combat in built-up areas

U.S. Marines in Irregular Warfare: Training and Education is a brief history that recounts how the U.S. Marine Corps adapted to fight the Global War on Terrorism during 2000-10. The Marine Corps has a long history of fighting irregular wars, including the Banana Wars in Central America during the 1920s and the Vietnam War during the 1960s. To battle the insurgencies in Iraq and Afghanistan, the Corps drew upon this experience while also implementing new plans and programs to better prepare Marines to carry out counterinsurgency operations. The Marine Corps updated the curriculum at the Command and Staff College and transformed the annual Combined Arms Exercise into Exercise Mojave Viper: an immersive training program that simulated the urban environments in which Marines would be operating in Southwest Asia. Most importantly, Marines adjusted in the field, as battalion and company commanders drew on their basic training and education to devise innovative tactics to better combat the new threats they now faced. ?us, as this story shows, the Marine Corps did not undergo a radical transformation to fight in Iraq and Afghanistan, but instead drew on principles that had defined it as a warfighting organization throughout most of its history. Keywords: United States Marine Corps; United States Marines; U.S. Marine Corps; U.S. Marines; Marines; Marine Corps; Global War on Terrorism; global war on terrorism; irregular warfare; military strategy; counterinsurgency; combat; iraq war; Iraq War; Afghanistan; military education; soldier training; combat training and tactics; Southwest Asia