The U.S. Army is the land warfare branch of the United States Armed Forces. Established in 1775, it is one of the oldest military organizations in the country. The Army's primary mission is to protect and defend the nation, support national policies, and achieve national objectives. It is composed of active duty, reserve, and National Guard units. The Army is organized into various divisions and brigades, each specializing in different combat and support roles. Soldiers undergo rigorous training to prepare for diverse missions, including combat operations, humanitarian assistance, and disaster relief. The Army also emphasizes leadership development and teamwork among its personnel.