United States Army - Official SiteOfficial website of the Department of the Army. The U.S. Army’s mission is to fight and win the Nation’s wars by providing prompt, sustained land dominance across the full range of military operations and spectrum of conflict in support of combatant commanders. By executing Title 10 and Title 32 United States Code directives, to include organizing, equipping, and training forces for the conduct of prompt and sustained combat operations on land, It accomplishes missions assigned by the President, Secretary of Defense and combatant commanders, while transforming for the future.