This Joint Chiefs of Staff manual, Joint Publication JP 6-0 Joint Communication System Change 1 October 2019, is the keystone document for the communications system series of publications. It provides fundamental principles and guidance to plan, execute, and assess communications system support to joint operations. An array of information, underpinned by joint doctrine, is utilized to employ combat power across the range of military operations. The communications system provides the means to synchronize joint forces. Reliable, secure, and synchronized information sharing among joint forces, multinational forces, and with non-Department of Defense agencies is essential for effective command and control in today's network-enabled environment. Information systems and networks provide the means to send, receive, share, and utilize information. The synthesis of advanced communications system capabilities and sound doctrine leads to information superiority, which is essential to success in all military operations. This publication is the Chairman of the Joint Chiefs of Staff (CJCS) official advice concerning communications in joint operations and provides considerations for military interaction with governmental and nongovernmental agencies, multinational forces, and other interorganizational partners. Joint doctrine established in this publication applies to the Joint Staff, commanders of combatant commands, subordinate unified commands, joint task forces, subordinate components of these commands, the Services, the National Guard Bureau, and combat support agencies. This doctrine constitutes official advice concerning the Joint Communication System.