Army Doctrine Publication (ADP) 1-02 provides foundational doctrine for establishing and using Army terms, acronyms, and symbols. It discusses how a common language is essential to the effective conduct of military operations. It describes how doctrinal terms and symbols enhance communication among military professionals and ensure a common understanding of doctrinal principles. ADP 1-02 addresses why terms and symbols are important. ADP 1-02 establishes the basis for Army doctrinal terms, acronyms, and symbols in Army Doctrine Reference Publication (ADRP) 1-02, Operational Terms and Military Symbols. ADP 1-02 and ADRP 1-02 are part of the Doctrine 2015 Initiative, which also includes a terminology database that will contain all doctrinal terms established in Army doctrinal publications. The principal audience for ADP 1-02 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 manual. Commanders, staffs, and subordinates ensure their decisions and actions comply with applicable U.S., international, and, in some cases, host-nation laws and regulations. Commanders at all levels ensure their Soldiers operate in accordance with the law of war and the rules of engagement. (See Field Manual FM] 27-10.) ADP 1-02 uses joint terms where applicable. Selected joint and Army terms and definitions appear in both the glossary and the text. For definitions shown in the text, the term is italicized and the number of the proponent publication follows the definition. ADP 1-02 is not the proponent for any Army terms. ADP 1-02 applies to the Active Army, Army National Guard/Army National Guard of the United States, and United States Army Reserve unless otherwise stated. References to the Marine Corps in this publication acknowledge the common terminology shared by the land services and contained in ADRP 1-02 but do not imply that ADP 1-02 is a Marine Corps publication. The proponent of ADP 1-02 is the United States Army Combined Arms Center. The preparing agency is the Combined Arms Doctrine Directorate, United States Army Combined Arms Center.