Army doctrine is a body of thought on how Army forces operate as an integral part of a joint force. Doctrine is a guide to action, not a fixed set of rules. Doctrine provides an Army unit or branch with a common philosophy, language, and purpose. FM 1-05 provides a cohesive understanding of the fundamentals of religious support (RS). It is the Army's doctrinal source for religious support planning, training, and operations.FM 1-05 is the Army's keystone manual for detailing fundamental principles of comprehensive religious support. This field manual provides the foundation for evaluating and refining tactics, techniques, and procedures for religious support operations (RSO). It provides a doctrinal approach to support decision making that helps commanders, their staffs, chaplain sections and unit ministry teams (UMTs) examine a situation, reach logical conclusions, and make informed decisions about how best to provide religious support in a given situation. This manual contains four chapters. Chapter 1 describes religious support foundations, including the historical precedents for the Army Chaplain Corps as well as its roles, missions, and functions. Chapter 2 delineates the current security environment, including the requirement to provide religious support across the range of military operations. Chapter 3 details the execution of religious support at the different levels of command within our modular Army. Chapter 4 depicts planning for religious support for unified land operations using the operations process. This publication applies to the Active Army, the Army National Guard (ARNG)/Army National Guard of the United States (ARNGUS), and the United States Army Reserve (USAR) unless otherwise stated. The principles of Army religious support doctrine presented in this manual enable chaplains and chaplain assistants to apply creative, flexible, and innovative approaches to specific missions and operational environments. Chaplains and chaplain assistants serving in a joint force land component command (JFLCC) or a joint task force (JTF) should refer to Joint Publication (JP) 1-05, Religious Affairs in Joint Operations, 13 Nov 09, and other joint planning publications for further guidance. FM 1-05 is nested with JP 1-05.Terms that have joint or Army definitions are identified in both the glossary and the text. Unless stated otherwise, masculine nouns or pronouns do not refer exclusively to men but to all Soldiers. Headquarters, United States Army Training and Doctrine Command (TRADOC), is the proponent for this publication. The preparing agency is the Army Doctrine Proponency Division, U.S. Army Combined Arms Center.