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. The Army is one of the largest military forces in the world and is organized into various units, including infantry, armor, and artillery. Established in 1775, the Army has played a crucial role in many significant conflicts, including the American Revolutionary War, the Civil War, and both World Wars. Its mission includes training soldiers, maintaining readiness, and providing humanitarian assistance during disasters and crises.