Marshal of the Royal Air Force Marshal of the Royal Air Force ( MRAF ) is the highest rank in the Royal Air Force . In peacetime it was granted to RAF officers in the appointment of Chief of the Defence Staff , and to retired Chiefs of the Air Staff , who were promoted to it on their last day of service . Promotions to the rank have ceased since the British defence cuts of the 1990s . While surviving Marshals of the RAF retain the rank for life , the highest rank to which officers on active service are promoted is now Air Chief Marshal . Although general promotions have ceased , further promotions to Marshal of the Royal Air Force are still possible in wartime and also for members of the Royal Family and certain other very senior officers in peacetime at the discretion of the Monarch . Marshal of the Royal Air Force is a 5 star rank and unlike the air marshal ranks , can properly be considered a marshal rank . MRAF has a NATO ranking code of OF - 10 , equivalent to an Admiral of the Fleet in the Royal Navy or a Field Marshal in the British Army . The rank was instituted in 1919 and the first officer to be promoted to MRAF was Sir Hugh Trenchard in 1927 . Since that time , including Trenchard , there have been 25 men who have held the rank . Of those , 21 have been professional RAF officers and four have been senior members of the British Royal Family . Technically King George V did not hold the rank but as the Chief of the Royal Air Force he did wear the uniform of a marshal of the RAF . The only two RAF officers ever to have held the rank without serving as Chief of the Air Staff were Lord Douglas of Kirtleside and Sir Arthur Harris . Origins . Prior to the creation of the RAF ' s officer rank titles in 1919 , it was proposed that by analogy with Field Marshal , the highest rank title should be Air Marshal . It was later decided to use the rank of Air Marshal as an equivalent rank to Lieutenant General and Marshal of the Air was put forward as the highest RAF rank . This new rank title was opposed by the then Chief of the Imperial General Staff , Sir Henry Wilson , who considered that the title was " ridiculous " . However , the Chief of the Air Staff , Sir Hugh Trenchard was unmoved and the title was adopted . This new title , which only existed on paper , did not last long . King George V took the view that the title of Marshal of the Air impinged upon the attributes which should properly be reserved for God and the rank title was changed at the King ' s request to Marshal of the Royal Air Force . Insignia , command flag and star plate . The rank insignia consists of four narrow light blue bands ( each on a slightly wider black band ) over a light blue band on a broad black band . This insignia is derived from the sleeve lace of an admiral of the fleet and is worn on the both the lower sleeves of the tunic or on the shoulders of the flying suit or the service working dress uniform . Marshals of the Royal Air Force wear shoulder board s with their service dress at ceremonial events . These shoulder boards show the air officer ' s eagle surrounded by a wreath , two crossed marshal ' s batons and , since the coronation of Queen Elizabeth II , the St Edward ' s Crown representing royal authority . Prior to 1953 , the Tudor Crown was used . The command flag of a Marshal of the Royal Air Force has a broad red horizontal band in the centre with a thinner red band on each side of it . The vehicle star plate for a Marshal of the Royal Air Force depicts five white stars ( Marshal of the Royal Air Force is equivalent to a five star rank ) on an air force blue background . The rank insignia and flag exists in some other air forces for equivalent ranks . The rank title differs slightly , often being a variation on Marshal of the Air Force . Marshals of the Royal Air Force . Excluding monarchs and members of the Royal Family , the only two RAF officers ever to have held the rank without serving as Chief of the Air Staff were Lord Douglas of Kirtleside and Sir Arthur Harris . Both held high command during World War II . Harris was Air Officer Commanding - in - Chief Bomber Command and Douglas was Air Officer Commanding - in - Chief Fighter Command , Middle East Command and Coastal Command . King George V did not formally hold the rank of marshal of the RAF ; rather he assumed the title of Chief of the Royal Air Force . In this capacity from time to time he wore RAF uniform with the rank insignia of a marshal of the RAF . He first publicly wore such uniform in 1935 , the year before his death . Unlike other MRAFs who only relinquished their appointments , Sir Peter Harding resigned from the RAF in 1994 . Consequently , his name is no longer to be found in the Air Force List .