The structure of the United States Air Force refers to the unit designators and organizational hierarchy of the United States Air Force, which starts at the most senior commands.
The senior headquarters of the Department of the Air Force consists of distinct staffs in the Pentagon: the Secretariat or SAF Staff and the Headquarters Air Force or HAF Staff. The Secretariat is headed by the Secretary of the Air Force (SECAF) and HAF Staff is led by the Chief of Staff of the Air Force (CSAF). Headquarters DAF also includes the Space Staff, which parallels the HAF Staff but governs the United States Space Force.