Brigadier-General David Henderson had served at the battle of Khartoum in 1898, and had distinguished himself in the South African War. He was the author of a book on _The Art of Reconnaissance_, which ran through several editions. His interest in reconnaissance, and his appreciation of its importance in war, made him a friend to aviation. In 1911, at the age of forty-nine, he had learned to fly at Brooklands, and thereafter, as Director of Military Training at the War Office, did all in his power to encourage the new movement. Captain Frederick Hugh Sykes was a General Staff officer who had seen service in many lands. In the South African War he served with the Imperial Yeomanry, and was severely wounded. In 1901 he joined the 15th or King's Hussars, and for two years was stationed in West Africa. Thereafter he was attached to the Intelligence Department at Army Headquarters in India, passed the Staff College, and in February 1911 became General Staff officer in the Directorate of Military Operations under Brigadier-General Sir Henry Wilson. It was in July and August 1904, while he was on leave from West Africa, that he made his first acquaintance with the air. He obtained permission to be attached to the balloon units training with the army on Salisbury Plain; made many ascents, and went through the course and examination at the Farnborough balloon school. Thenceforward he took every possible opportunity to improve his knowledge of aeronautics. He was quick to discern the significance of aviation. When, in 1910, he saw flight in France, he recognized that the work of cavalry in distant reconnaissance was dead and done with. During his time at the War Office he spent the mornings, before breakfast, in learning to fly, and in June 1911 took his pilot's certificate on a Bristol biplane at Brooklands. Within the office he insisted on the importance of military aeronautics, and when the Committee of Imperial Defence took up the question he was naturally chosen to serve on the committee which prepared a draft organization. Associated with him was Major Duncan Sayre MacInnes, of the Royal Engineers, who had been through the South African War, and at the time of the formation of the Flying Corps was serving with the Military Training Directorate. Only those who worked with him will ever know how great a debt the Flying Corps owes to his industry and devotion. During the war he was employed under the Directorate of Military Aeronautics, and in 1916 was made Director of Aircraft Equipment, with the rank of brigadier-general. He wore himself out in the service of the country, and died in May 1918. These three men laid the groundwork of the plans which were approved by the technical sub-committee.