The United States Air Force Scientific Advisory Board (SAB) is a Federal Advisory Committee that provides independent advice on matters of science and technology relating to the Air Force mission, reporting directly to the Secretary of the Air Force and Chief of Staff of the Air Force. In the past, it has provided advice on technologies such as: supersonic aircraft, weather forecasting, satellite communications, medical research, crewless airplanes, and defenses against aircraft and missiles. Today, the SAB performs in-depth reviews of the Air Force Research Laboratory's science and technology research, and performs studies on topics tasked by the Secretary and Chief of Staff. Members are appointed by the Secretary of Defense.