This Army tactics, techniques, and procedures (ATTP) manual provides doctrinal guidance and procedures that will enhance the delivery of human resources (HR) support in brigade and battalion S-1 sections. It will help HR leaders to guide actions and provide procedures to enable decision making.This publication is nested with Field Manual (FM) 1-0, Human Resources Support, and provides overarching doctrinal guidance and direction for conducting S-1 operations. ATTP 1-0.1 promotes a common understanding of HR support fundamentals at battalion, brigade, or brigade equivalent level S-1 sections throughout the Army Force Generation (ARFORGEN) cycle. This manual, along with FM 1-0, provides sufficient information to allow for execution of all required HR missions and functions dictated by current operational requirements and anticipated future actions. ATTP 1-0.1 provides the doctrinal base for developing operations plans (OPLANs) and associated standing operating procedures (SOPs). Leaders and HR operators at all levels must apply these fundamentals using the military decision-making process (MDMP); troop leading procedures; and mission, enemy, terrain and weather, troops and support available, time available, civil considerations (METT-TC). This publication is an authoritative guide that requires judgment in application. ATTP 1-0.1 consists of three chapters and four appendices which address the operational roles of the S-1 and how the S-1 supports subordinate organizations during all military operations. It discusses and defines the roles and functions of S-1 sections and the support they provide to the generating and operating forces.• Chapter 1 describes the organization and structure of the brigade and battalion S-1 section. 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 brigade, brigade equivalent, and battalion S-1s; and how HR support is provided during reach operations (Rear Detachment), deployment cycle support (DCS), and military operations.• Chapter 2 describes the specific duties and responsibilities of the brigade and battalion S-1 Leadership Element, Personnel Readiness Team (PR TM), HR Services Team, and Rear Detachment. Provided are key duties and responsibilities which assist S-1s in planning, coordinating, and executing HR support for their unit.• Chapter 3 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 HR subordinate key functions within the brigade and battalion S-1 sections.• Appendix A provides critical information to brigade and battalion S-1s on specific HR tasks that are associated with the seven stages of DCS.• Appendix B provides key information to 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 systems that S-1s are required to access and operate. Specific HR automation systems used by S-1s within the brigade and battalion are described along with other non-HR systems that impact daily HR operations.• Appendix D provides an S-1 assessment checklist or guide for brigade and battalion S-1s to assist in assessing the effectiveness of the S-1 section.ATTP 1-0.1 applies to all Army components across the operating and generating forces, and during all levels of military operations. It assumes S-1s are fully staffed with technically proficient HR professionals.