Abstract: In January 2007, the Joint Staff issued Joint Publication 3-13.1 Electronic Warfare, which updated the previous joint EW doctrine contained in Joint Publication 3-51 Joint Doctrine for Electronic Warfare issued in April 2000. In 115 pages, JP3-13.1 sets forth the doctrine "to govern the activities and performance of the Armed Forces of the United States in operations and provides the doctrinal basis for interagency coordination and for US military involvement in multinational operations. It provides military guidance for the exercise of authority by combatant commanders and other joint force commanders and prescribes joint doctrine for operations and training. It provides military guidance for use by the Armed Forces in preparing their appropriate plans".