The United States Army participates in conflicts.
United States Army . As a branch of the armed forces , the mission of the U.S. Army is `` to fight and win our Nation 's wars , by providing prompt , sustained , land dominance , across the full range of military operations and the spectrum of conflict , in support of combatant commanders . '' The branch participates in conflicts worldwide and is the major ground-based offensive and defensive force of the United States .