Marshal of the Royal Australian Air Force (MRAAF) is the highest rank of the Royal Australian Air Force and was created as a direct equivalent of the British Royal Air Force rank of Marshal of the Royal Air Force.
 It is considered a five-star rank.
As a cricketer, Walker made his first-class debut for New South Wales at The Gabba in 1948/49 and played for the state until the 1952/53 season.
 He was selected for the 1949/50 tour of South Africa led by Lindsay Hassett, but was behind the likes of Keith Miller and Ray Lindwall in the pecking order and never played Test cricket.
 He later played county cricket in England for Nottinghamshire, taking 55 wickets in the 1956 season.
Keith Ross Miller, {'1': ", '2': ", '3': ", '4': "} (28 November 1919 – 11 October 2004) was an Australian test cricketer and a Royal Australian Air Force pilot during World War II.
 Miller is widely regarded as Australia's greatest ever all-rounder.
 Because of his ability, irreverent manner and good looks he was a crowd favourite.
 English journalist Ian Wooldridge called Miller "the golden boy" of cricket, leading to his being nicknamed "Nugget".
 He "was more than a cricketer ... he embodied the idea that there was more to life than cricket".
The Royal Australian Air Force Ensign is used by the Royal Australian Air Force and the Australian Air Force Cadets in Australia and overseas.
 It is based on the Australian national flag, with the field changed to Air Force blue, and the southern cross tilted clockwise to make room for the RAAF roundel inserted in the lower fly quarter.
 The roundel is a red leaping kangaroo on white within a dark blue ring.
 The ensign was proclaimed as a Flag of Australia under section 5 of the Flags Act on 6 May 1982.
Most countries with military aviation forces have a system for naming of military airbases.
 "Air Force Base" ("AFB") is part of the name of military airbases of the United States Air Force (USAF) and the South African Air Force (SAAF), with the USAF using it at the end of the name of the base (e.g. "Dover AFB"), and the SAAF using it at the start (e.g. "AFB Hoedspruit").
 The Royal Australian Air Force uses a slightly different format referring to bases as "RAAF Base" (Royal Australian Air Force Base).
 The Canadian Forces also uses a different format referring to any base as "CFB" (Canadian Forces Base) or "BFC" in French ("Base des Forces Canadiennes").
Air vice-marshal (abbreviated as AVM) is the third highest active rank of the Royal Australian Air Force and was created as a direct equivalent of the British Royal Air Force rank of air vice-marshal.
 It is also considered a two-star rank.
 The Australian Air Corps adopted the RAF rank system on 9 November 1920 and this usage was continued by its successor, the Royal Australian Air Force.
The following is a list of Australians who have attained air marshal rank within the Royal Australian Air Force (RAAF); that is, service personnel who have held the rank of air chief marshal (four-star rank), air marshal (three-star rank) or air vice marshal (two-star rank).
 The Royal Australian Air Force was established in 1921 as a separate branch of the Australian military forces.
 The service was modelled after the Royal Air Force—formed three years earlier—and adopted the same ranking system.
 Richard Williams, regarded as the "father" of the Royal Australian Air Force, was the service's first member to obtain air-officer rank on being promoted to air commodore (one-star rank) in 1927; he went on to become the first air vice marshal (1935) and air marshal (1940).
 In 1965, Sir Frederick Scherger became the first officer to be advanced to air chief marshal, one of only four members of the Royal Australian Air Force to obtain this rank as of June 2014.
 A further nineteen individuals have reached air marshal in the RAAF and 126 air vice marshal; seven officers have retired with the honorary rank of air vice marshal.
Group Captain Clive Robertson Caldwell, (28 July 1911 – 5 August 1994) was the leading Australian air ace of World War II.
 He is officially credited with shooting down 28.5 enemy aircraft in over 300 operational sorties.
 In addition to his official score, he has been ascribed six probables and 15 damaged.
 Caldwell flew Curtiss P-40 Tomahawks and Kittyhawks in the North African Campaign and Supermarine Spitfires in the South West Pacific Theatre.
 He was the highest-scoring P-40 pilot from any air force and the highest-scoring Allied pilot in North Africa.
 Caldwell also commanded a Royal Air Force (RAF) squadron and two Royal Australian Air Force (RAAF) wings.
 His military service ended in controversy, when he resigned in protest at the misuse of Australian First Tactical Air Force's fighter units and was later court martialed and convicted for trading liquor.
The military career of Keith Miller, an Australian Test cricketer and Australian rules footballer, lasted from August 1940 until June 1946, when World War II interrupted his sporting career.
 Miller enlisted in the Militia, before switching to the Royal Australian Air Force, where he served from November 1941 until 1946 when he was discharged with the rank of flying officer.
 Miller trained as a fighter pilot, and in the last month of the European theatre of war, he flew combat missions over German installations.
 However, Miller was more notable for his efforts as a cricketer, representing the Royal Australian Air Force cricket team and after VE Day, the Australian Services in the Victory Tests of 1945, followed by a tour of the Indian subcontinent and Australia before being demobilised.
The Desert Air Force (DAF), also known chronologically as Air Headquarters Western Desert, Air Headquarters Libya, the Western Desert Air Force, and the First Tactical Air Force (1TAF), was an Allied tactical air force created from No. 204 Group under RAF Middle East Command in North Africa in 1941 to provide close air support to the British Eighth Army.
 Throughout World War II, the DAF was made up of squadrons from the Royal Air Force (RAF), the South African Air Force (SAAF), the Royal Australian Air Force (RAAF), the United States Army Air Forces (USAAF) and other Allied air forces.

Question: Which Royal Australian Air Force pilot was also part of the 1949/1950 tour of South Africa? 
Answer: Keith Miller