This United States Army manual, Training Circular TC 3-12.2.4.1 Analytic Support to Defensive Cyberspace Operations January 2024, discusses the use of data analytics in support of defensive cyberspace operations. The principal audience for this publication is analytic support personnel and data engineers who support defensive cyberspace operations. Commanders and staffs of Army headquarters serving as joint task force or multinational headquarters should also refer to applicable 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.