This manual is designed to fill a doctrinal gap. It has been 20 years since the U.S. Army published a manual devoted to counterinsurgency operations, and 25 since the Marine Corps published its last such manual. With our Soldiers and Marines fighting insurgents in both Afghanistan and Iraq, it is thus essential that we give them a manual that provides principles and guidelines for counterinsurgency operations (COIN). This field manual/Marine Corps reference publication (FM/MCRP) establishes...