(1892–1987) was an air vice marshal in the Royal Australian Air Force (RAAF). A pioneering flyer and aviation scholar, he piloted the first trans-Australia flight from Melbourne to Darwin in 1919, and afterwards laid the groundwork for the RAAF’s air power doctrine. During World War I, he joined the Australian Flying Corps and saw combat with No. 3 Squadron on the Western Front, earning the Distinguished Flying Cross; he later commanded the unit and published a history of its wartime exploits. He was awarded the Air Force Cross for his 1919 cross-country flight. He was a founding member of the RAAF in 1921. In 1936, he was promoted to group captain and took command of RAAF Station Laverton. Raised to air commodore soon after the outbreak of World War II, he became Air Member for Personnel in November 1940. He was appointed a Commander of the Order of the British Empire the next year. He served as Air Officer Commanding RAAF Overseas Headquarters, London, from 1942 until his retirement from the military in 1946. His writings on air power were collected and published posthumously as The Decisive Factor in 1990.