1912-1954 1939-1945 20thcentury alan armedforces artificialintelligence autobiography biography british buckinghamshire computablefunctions cryptographers cryptography desch electronicintelligence england espionage german germany greatbritain historical history intelligence joseph logic mathematics militaryintelligence modern navaloperations officers philosophy politicalscience secretservice socialhistory submarine submarines(ships) symbolicandmathematical theft turing ultra(intelligencesystem) unitedstates worldwar