"This field manual/Marine Corps war-fighting 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. 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."
FM 3-24/MCWP 3-33.5
U.S. Army Combined Arms Center and Fort Leavenworth: http://leav-www.army.mil/