Marine Corps Tactical Publication (MCTP) 3-03C, MAGTF Interorganizational Coordination, is designed to assist Marines at every level in coordinating with United States governmental agencies, intergovernmental organizations, and nongovernmental organizations, and commercial entities that may be required to achieve national objectives in today’s complex operational environments. This publication underscores the importance of pursuing the unity of effort needed for success in contingency operations that require interoperability with a host of organizations that are not part of Marines’ formal chain of command. The intent of this publication is to provide Marines with the basics necessary to integrate MAGTF operations with the other instruments of national power. MCTP 3-03C is a guide for understanding the “combined tools” of interorganizational partners. The most important features of this publication are the information leads, which can be expanded by any Marine using a computer and an Internet search engine.