The United States Marine Corps is the largest such force on the planet, and yet it is the smallest, most elite section of the U.S. military, one with a long and storied history and current operations that are among the most sophisticated in the world. Here, in the most current version of the manual used by the Corps itself, is the guidebook used by the service in its counterintelligence support of the Marine airground task force. Learn about: . how counterintelligence (CI) supports strategic, operational, and tactical levels of war . the command structure of Marine CI organizations . how intelligence missions are planned and operatives deployed . the operation of such activities as mobile and static checkpoints, interrogation, and surveillance . counterintelligence training . and much, much more. Military buffs, wargamers, readers of espionage thrillers, and anyone seeking to understand how American armed services operate in the ever-changing arena of modern warfare will find this a fascinating and informative document.