Army Doctrine Publication (ADP) 1 is prepared under the direction of the Chief of Staff of the Army and is his vision for the Army. It states what the Army is, what the Army does, how the Army does it, and where the Army is going. It establishes the Army's contribution to America's landpower. ADP 1 delineates the Army's mission, purpose, and roles, deriving them from the Constitution; the Congress, in Title 10, United States Code; and the Department of Defense, in Department of Defense Directive 5100.01. Army doctrine supports and is consistent with joint doctrine. This publication connects Army doctrine to joint doctrine as expressed in the relevant joint publications, especially Joint Publication (JP) 1, Doctrine for the Armed Forces of the United States, and JP 3-0, Joint Operations. ADP 1 also links the National Security, National Defense, and National Military Strategies with the Army's operational doctrine in ADP 3-0. The principal audience of ADP 1 includes combatant commanders, other Services, all serving Soldiers, and all Army Civilians. All photographs in this publication are from Department of Defense photographic archives available online at DefenseImagery.mil and associated Army Web pages. ADP 1 implements the standardization agreement entitled Allied Joint Publication (AJP)-01, Allied Joint Doctrine. ADP 1 uses joint terms where applicable. For terms and their definitions in the text, the term is italicized and the number of the proponent publication follows the definition. ADP 1 applies to the Active Army, Army National Guard/Army National Guard of the United States, and United States Army Reserve unless otherwise stated. United States Army Combined Arms Center is the proponent for this publication. The preparing agency is the Combined Arms Doctrine Directorate, United States Army Combined Arms Center.