This United States Army publication, Field Manual FM 3-12 Cyberspace Operations and Electromagnetic Warfare August 2021, provides tactics and procedures for coordinating, integrating, and synchronizing Army cyberspace operations and electromagnetic warfare to support unified land operations and joint operations. FM 3-12 explains Army cyberspace operations and electromagnetic warfare fundamentals, terms, and definitions. This publication describes how commanders and staffs can integrate cyberspace operations and electromagnetic warfare into unified land operations. This publication provides overarching guidance to commanders and staffs on Army cyberspace operations and electromagnetic warfare at all echelons. This publication supersedes FM 3-12, dated 11 April 2017.

The principal audience for FM 3-12 is all members of the profession of arms. Commanders and staffs of Army headquarters serving as a joint task force or multinational headquarters should also apply joint or multinational doctrine concerning the range of military operations and joint or multinational forces. Trainers and educators throughout the Army will also use this publication.