Career
Jackman joined the Royal Air Force in 1926 initially serving as a Stores Officer. He served in World World War II as an Administrative Staff Officer at Headquarters Royal Air Force Middle East, then as Air Officer Administration at Headquarters Mediterranean Air Command before becoming Assistant Air Officer Administration at Headquarters Mediterranean Allied Air Forces and then Air Officer Administration at Headquarters Balkan Air Force. After the War he was appointed Director of Movements and then Director of Organisation (Forecasting and Planning) at the Air Ministry.
He went on to be Air Officer Commanding Number.
40 Group in 1952, Director-General of Equipment at the Air Ministry in 1955 and Air Officer Commanding Royal Air Force Maintenance Command in 1958, where he laid the foundation stone for a new Headquarters at Andover before retiring in 1961. In retirement he became Chief Company-ordinator of the Anglo-American Community Relations Scheme in the United Kingdom.