The Hobson Plan was an organizational structure established by the United States Air Force (USAF) in 1948, following experimental organization in 1947. Known as the "Wing-Base Organization," it replaced the organization used by the United States Army Air Forces (AAF), the predecessor organization of the USAF, which used separate chains of command for combat and support units. The plan made the wing the basic combat unit of the AAF, rather than the group and placed all support elements on a base under the command of the wing commander in addition to combat elements.