The United States Department of the Air Force is a branch of the U.S. Armed Forces responsible for aerial and space operations. It was established as a separate military service in 1947, evolving from the United States Army Air Forces. The department's primary mission is to defend the nation through control and exploitation of air and space. The Air Force is tasked with various roles, including air superiority, intelligence, surveillance, reconnaissance, and strategic bombing. It operates a wide range of aircraft and technologies, ensuring national security and supporting other military branches in joint operations.