united states army
United States Army. The land-combat and land-operations branch of the United States armed forces. • This branch includes supporting air- and water-transport services such as the Army Air Corps. The Army includes the Regular Army (the standing force), the Army Reserve, and the Army National Guard when in active federal service, as in time of war or other national emergency. The United States Army is under the authority of the U.S. Department of the Army. — Also termed land forces. — Abbr. USA.
