The United States Army is the land warfare branch of the United States Armed Forces. It is responsible for protecting and defending the country, conducting military operations, and supporting national policies. Established in 1775, the Army has played a crucial role in various conflicts, including the American Revolutionary War and both World Wars. The Army is composed of active duty, reserve, and National Guard units. Its mission includes training soldiers, maintaining equipment, and preparing for combat. The Army also engages in humanitarian efforts and disaster relief, showcasing its commitment to both national security and community support.