Brigadier Ernest Goode, CBE who attended BGS in the early 1920s had a long military career. He was commissioned into the Royal Army Service Corps and soon after seconded for duty with the Sudan Defence Force, 1935-43. Following this wartime service he was appointed aide-de-camp to The Queen, 1959-62.
If you want to hear more about his time in the Sudan, a recording of his experiences in the Sudan is available on the Imperial War Museum's website:
https://www.iwm.org.uk/collections/item/object/80004261