Fm 3-0 presents overarching doctrinal guidance for conducting Army operations. This edition (the first update in seven years) constitutes the Army's view of how it conducts operations on land and it sets the foundation for developing the tactics, techniques, and procedures detailed in subordinate field manuals. Four appendixes complement the body of the manual. The principles of war and operations are in appendix A. Command and support relationships are in appendix B. A brief description of modular force is in appendix C. And a discussion of the purpose of doctrine in the Army is in appendix D. The principal audience for Fm 3-0 is the middle and senior leadership of the Army, officers in the rank of major and above who command Army forces or serve on the staffs that support those commanders.