Army - United States Army - "Cold War" Service Ribbons MugThe United States Army (USA) is the land service branch of the United States Armed Forces. It is one of the eight U. S. uniformed services, and is designated as the Army of the United States in the U. S. Constitution. As the oldest and most senior branch of the U. S. military in order of precedence, the modern U. S. Army has its roots in the Continental Army, which was formed (14 June 1775) to fight the American Revolutionary War (17751783)before the