United States Army | Army Knowledge Online - AKO

The United States Army (U.S. Army) is the land service branch of the United States Armed Forces. The U.S. Army has a rich history. The U.S. Army is part of the Department of Defense. The Army's mission is to protect the American people, defend the nation, and defeat enemies, with a focus on readiness, modernization, and leadership development. The U.S. Army has a rich history, with notable figures playing significant roles in shaping the institution. Today, the Army continues to evolve, with a focus on emerging technologies, such as artificial intelligence and cybersecurity, to address the complex security challenges of the 21st century.