Army techniques publication ATP 1-0.1, G-1/AG and S-1 Operations, provides doctrinal guidance and procedures that enhance the delivery of human resources (HR) support in corps and division assistant chief of staff, personnel (G-1)/Adjutant General (AG) and brigade and battalion S-1 sections. ATP 1-0.1 promotes a common understanding of HR support fundamentals at corps and division G-1/AG and battalion, brigade, or brigade equivalent level S-1 sections throughout the Army Force Generation (ARFORGEN) cycle. This publication is an authoritative guide that requires judgment in application. The principal audience for ATP 1-0.1 is all members of the profession of arms. 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. ATP 1-0.1, G-1/AG and S-1 Operations, is the first revision of this publication. ATP 1-0.1 provides HR professionals, commanders, and staffs an understanding of the corps and division G-1/AG section and brigade and battalion S-1 section operational roles and how they support subordinate organizations during all military operations. This publication discusses and defines the roles and functions of G-1/AG and S-1 sections and the support they provide to the operating and generating forces. ATP 1-0.1 contains four chapters and four appendices: Chapter 1 describes the organization and structure of the corps and division G-1/AG and brigade and battalion S-1 sections. It discusses where HR support is performed; how specific HR support operations are conducted during each force pool of ARFORGEN; an overview of the supporting and supported relationships of corps and division G-1/AGs, and brigade, brigade equivalent, and battalion S-1s; how HR support is provided during reach operations (Rear Detachment), deployment cycle support (DCS), and military operations; and home station operations. Chapter 2 describes the specific duties and responsibilities of the corps and division G-1/AG section. Provided are key duties and responsibilities which assist G-1/AGs in planning, coordinating, and executing HR support for their units. Chapter 3 describes the specific duties and responsibilities of the brigade and battalion S-1 section. Provided are key duties and responsibilities which assist S-1s in planning, coordinating, and executing HR support for their unit. Also provided are brief overviews of the Role of the Adjutant and HR metrics. Chapter 4 describes the four fundamental HR core competencies of man the force, provide HR services, coordinate personnel support, and conduct HR planning and operations which provide a framework for the HR subordinate key functions within the corps and division G-1/AG and brigade and battalion S-1 sections. Appendix A provides critical information to corps and division G-1/AGs and brigade and battalion S-1s on specific HR tasks that are associated with the seven stages of DCS. Appendix B provides key information to corps and division G-1/AGs and brigade and battalion S-1s on the management of United States Army Reserve (USAR) and Army National Guard (ARNG) personnel during mobilization and demobilization in support of Army military operations. Described are specific HR tasks associated with the nine phases of mobilization under the Army Mobilization Operations Planning and Execution System, which establishes procedures and standards for Reserve Component (RC) mobilization. Appendix C provides information on HR databases and systems that G-1/AGs and S-1s are required to access and operate. Appendix D provides an S-1 assessment checklist or guide for brigade and battalion S-1s to assist in assessing the effectiveness of their S-1 sections.