FM 1, The Army, is The Armys capstone doctrinal manual prepared under the direction of the Chief of Staff, Army. It tells us who we are, what we do, and how we do it. It points the way to the future and establishes doctrine for employing land power in support of the national security strategy and the national military strategy. It also delineates The Armys purpose, roles, and functions as established by the Constitution; the Congress in Title 10, USC; and the Department of Defense Directive 5100.1. FM 1 is the Chief of Staff, Armys guidance to The Army. FM 1s audience is broad. It includes the National Command Authorities; Congress; Office of the Secretary of Defense; joint staff; combatant commanders; other services; officers, noncommissioned officers, and Soldiers of The Army; and Department of the Army civilians.