Group captain the wing commander and group captain command pennants are triangular in shape. The rank of group captain is also used in a number of the air forces in the Commonwealth, including the Bangladesh Air Force, Ghana Air Force, Indian Air Force (IAF), Nigerian Air Force, Pakistan Air Force (PAF), Royal Australian Air Force (RAAF), Royal New Zealand Air Force (RNZAF), Sri Lankan Air Force and the Trinidad and Tobago Air Guard. It is also used in the Egyptian Air Force, Hellenic Air Force, Royal Air Force of Oman and the Royal Thai Air Force. The Royal Canadian Air Force used
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