Squadron leader a flying squadron is usually commanded by a wing commander, with each of the two flights under a squadron leader. However, ground-operating squadrons which are sub-divisions of a wing are ordinarily commanded by a squadron leader. This includes squadrons of the RAF Regiment and University Air Squadrons. The rank insignia consists of a thin blue band on a slightly wider black band between two narrow blue bands on slightly wider black bands. This is worn on both the lower sleeves of the tunic or on the shoulders of the flying suit or the casual uniform. Squadron leaders are the lowest
Marshal of the air force held once and is currently retained only on paper. China also does not use a marshal rank, preferring first class general ("kong jun yi ji shang jiang") which has never been held by an air force officer and was abolished in 1994. Spain uses the equivalent rank of captain general of the Air Force which is held only by HM King Felipe VI. A marshal of the air force is mentioned in Roald Dahl's book "The BFG". Dahl himself was a Royal Air Force officer during World War II. Marshal of the air force Marshal of the air force is