Caspar John as the Royal Navy's aviation advocate

Caspar John's career ran from wartime aircraft purchasing in the United States to command of the escort carrier HMS Pretoria Castle and light fleet carrier HMS Ocean. Ocean later hosted the first jet takeoffs and landings from an aircraft carrier, linking John's command experience directly to the emerging jet era. His later appointments covered naval air stations, air equipment, training, carrier squadrons, the Ministry of Supply, and the Naval Staff. John eventually served as Vice Chief of the Naval Staff and then First Sea Lord from 1960 to 1963. The breadth of that career gave a practicing Fleet Air Arm pilot unusual influence over both operational aviation and Whitehall decision-making. His daughter Rebecca completed his unfinished autobiography after his death.