'Shan' Hackett is remembered by his own and succeeding generations for a variety of achievements and attributes. A superb fighting soldier, he served with the Trans-Jordan Force, had fought through North Africa and was involved in the formation of the Long Range Desert Group, the SAS and Popski's Private Army. He went on to raise 4th Parachute Brigade which he commanded with flair at Arnhem where he was wounded and captured. He escaped and got back to British lines. He rose to high rank filling key command and staff appointments in the British Army and NATO.

Always an intellectual, yet highly practical, man, he retired to become Principal of King's College London where he was revered by staff and students. He wrote many acclaimed works including The Third World War and its sequel The Third World War - The Untold Story. He was constantly in demand for his television programmes and radio commentary up to his death in 1997.