Shelmerdine served in France and in Egypt and in November 1915, was transferred from Alexandra, Princess of Wales's Own Yorkshire Regiment (unofficially known as the
Green Howards at that time) to the
Royal Flying Corps. In 1919, as a Lieutenant-Colonel, Shelmerdine joined the staff of the Civil Aviation Department at the
Air Ministry. When
Brigadier-General Festing was Controller of Aerodromes and Licences, Shelmerdine became his assistant, and when the department became a directorate and Festing left, Shelmerdine took on the role. He was later dispatched to
Cairo to ensure the smooth-running of the
Cairo to
Karachi air service. In 1927 he was posted to India, to serve as the Director of Civil Aviation there. He returned to the Air Ministry in 1931 as the home country's Director of Civil Aviation following the death of
Sir Sefton Branker who was killed in the
R101 airship crash. Shelmerdine was Director General of Civil Aviation from 1934 to 1941, when he had to retire under age regulations. == Personal life ==