Sir Richard Williams (1890–1980) is regarded as the "father" of the Royal Australian Air Force. He was the first military pilot trained in Australia, and commanded fighter units in World War I. A proponent of independent air power, Williams played a leading role in the establishment of the RAAF and became its first and longest-serving Chief of the Air Staff (CAS). Born into a working class family, he was an Army Lieutenant when he learned to fly in 1914. As a pilot with the Australian Flying Corps in World War I, Williams commanded No. 1 Squadron and later 40th Wing RAF, earning the Distinguished Service Order. Afterwards he campaigned for an Australian Air Force separate from the Army and Navy, and this came into being on 31 March 1921. The fledgling RAAF faced challenges to its existence for the next decade, and Williams was credited with maintaining its independence. However an adverse report on flying safety saw him dismissed as CAS prior to World War II. Despite promotion to Air Marshal in 1940, he never again commanded the RAAF. After the war he was forcibly retired and took up the position of Director-General of Civil Aviation. He was knighted shortly before his retirement in 1955.