In the introduction to his official history of British intelligence in the Second World War, Professor F.H. Hinsley says he has not attempted to cover the war in the Far East, ‘when this was so much the concern of the United States’. The United States, on the other hand, did not hesitate to publicise its signals intelligence victories over the Japanese. The nature of signals intelligence is such that a smaller country, like Australia, can and did make a difference. But because there has been no official history of Australian intelligence in the Second World War, Australia’s achievements have been largely overlooked and are only now beginning to receive recognition.