Information: - The Royal Air Force (RAF) is the United Kingdom's aerial warfare force. Formed towards the end of the First World War on 1 April 1918, it is the oldest independent air force in the world. Following victory over the Central Powers in 1918 the RAF emerged as, at the time, the largest air force in the world. Since its formation, the RAF has taken a significant role in British military history, in particular, playing a large part in the Second World War where it fought its most famous campaign, the Battle of Britain. - Squadron leader (Sqn Ldr in the RAF and PAF; SQNLDR in the RAAF and RNZAF; formerly sometimes S/L in all services) is a commissioned rank in the Royal Air Force and the air forces of many countries which have historical British influence. It is also sometimes used as the English translation of an equivalent rank in countries which have a non-English air force-specific rank structure. - Squadron Leader Lord David Douglas - Hamilton ( 8 November 1912 -- 2 August 1944 ) was a Scottish nobleman , pilot , and boxer . He was the youngest son of Lt. Alfred Douglas - Hamilton , 13th Duke of Hamilton RN and his wife Nina , nee Poore . Douglas - Hamilton was one of four brothers who made history by simultaneously being at the rank of Squadron Leader or above at the outset of World War II , he himself commanding No. 603 Squadron RAF from 18 December 1941 till 20 July 1942 . Educated at Harrow , and Balliol College , Oxford . Douglas - Hamilton saw active service between 1939 and 1944 , flying Spitfires in Operation Torch over Malta . On return to Britain , he was killed whilst carrying out reconnaissance over the French coast , and crashed in southern England . At the 1934 Empire Games he won the bronze medal in the heavyweight class of the boxing tournament . What is the relationship between 'lord david douglas-hamilton' and 'royal air force'?
A:
military branch