David served 45 years with the Ministry of Defence, 22 years as a photographer with the Royal Air Force, followed by 23 years as an Instructional Officer with the Defence School of Photography. He appeared on the BBC TV programme “Inside Out” and the Channel 4 TV documentary series “Time Watch” featuring a missing wartime photo reconnaissance pilot. He has also appeared on similar documentaries for the American Discovery Channel series “Spies in the Sky” and the Australian Discovery channel programmes “Last Plane out of Berlin”.