Operation Fido (Fog Investigation Dispersal Operations) First Pictures. Mr. Geoffrey Lloyd, Secretary of the Petroleum Warfare Department and the new Minister of Information, talking to R.A.F., fliers on one of the airfields where fog dispersal, apparatus in installed. These are the first official RAF photographs to be released of operation FIDO showing the way fog was dispersed by artificial means from RAF airfields FIDO provides the necessary heat on airfields to bring about fog dispersal by a continuous line of burners installed on each side of the main runway. October 29, 1945. (Photo by PNA).