First published in September 2001, Marine Corps Doctrinal Publication (MCDP) 1-0, Marine Corps Operations, provided a bridge between the maneuver warfare philosophy articulated in our first nine MCDPs and the tactics, techniques, and procedures contained in our warfighting and reference publications. It focused on describing the role of the Marine Corps component in providing, sustaining, and deploying Marine Corps Forces at the operational level of war and on how the largest of our Marine air-ground task forces (MAGTFs), the Marine expeditionary force, conducted operations at the tactical level. Developed just prior to, and published shortly after, the momentous events of 11 September 2001, the original edition reflected the language and operational constructs prevalent within joint doctrine at that time. Key among them were the notions of “war” versus “military operations other than war,” as well as the unstated, but imbedded, belief that the ability to defeat a conventional adversary granted the ability to succeed against “lesser” foes.