George Medal for risking his life in helping Francis Fasson and Colin Grazier in recovering 'short signal' codebooks which provided a breakthrough in cryptanalysis of the German Naval Enigma from the sinking Alan Bruce William Bundy, US Army Signal Corps (member of the CIA and foreign affairs advisor to Presidents John F. Kennedy and Lyndon B. Johnson) James Ramsay Montagu Butler (politician and historian) Elizabeth Byng John Cairncross, Soviet spy Peter Calvocoressi, intelligence officer (RAF) J. W. S. Cassels John Chadwick Caroline Chojecki MBE, intelligence database analyst (Soviet Studies Research Centre, Sandhurst database analyst) John Christie, codebreaker Joan Clarke (later Murray), mathematician (briefly engaged to Alan Turing) William Clarke, Head of Naval Section, then of Italian Naval subsection Tom Colvill, general Manager of the Testery Arthur Cooper, British Foreign Office linguist (Chinese and Japanese), FECB then FRUMEL Josh Cooper, cryptographer Margaret Cooper (née Douglas) Michael Crum, worked on the Siemens and Halske T52 teleprinter cipher, codenamed "STURGEON" Alec Naylor Dakin (cryptographer) worked in hut 4 decrypted premature message about death of Hitler during German assassination attempt Dorrit Dekk, Czechoslovakian emigrant designer who joined the Wrens and worked as a 'listener' during the war Alexander "Alistair" Denniston, Deputy Director of GC&CS Nakdimon ("Naky") Doniach, RAF, linguist (later GCHQ and Oxford University) Dorothy Du Boisson, operator of the Colossus computer Peter Edgerley, codebreaker Peter Ericsson, Testery shift-leader, linguist and senior codebreaker Margaret "Peggy" Erskine-Tulloch née Seton, one of the first Wrens at Bletchley Park, was a Bombe operator, instructor and watch officer John Davies Evans Francis Anthony Blair Fasson, Lieutenant RN was posthumously awarded the George Cross for the "for outstanding bravery and steadfast devotion to duty in the face of danger" that he displayed on 30 October 1942 in boarding, with Able Seaman Colin Grazier, the sinking U-boat U-559 and recovering 'short signal' codebooks which provided a breakthrough in Cryptanalysis of the German Naval Enigma but losing his life in the process Jane Fawcett, was credited with identifying the message that led to the sinking of the battleship Bismarck, a great Allied naval victory Harry Fensom, the creator of the British Tunny machine which was used in decoding messages in the Lorenz Cipher Michael Field, foreign correspondent for the Daily Telegraph for thirty years, living in South America, Southeast Asia and France Harold Fletcher; Hut 6, involved in Bombe administration from August 1941 Tommy Flowers, post office engineer and designer of