Introduction
Early cryptology, secrets & intelligence
From Federation & the Anglo-Boer War to the First World War
First World War Allied Sigint
Sigint in the Second World War, 1939-41
Sigint arrangements & the war in the Pacific
Wartime Sigint successes, bureaucratic & other challenges
Postwar Sigint to Vietnam
Reform, computers & military Sigint since the 1970s
Legislative reform & the coming of cyber
Conclusion & looking ahead
Appendix A. Central Bureau, Brisbane, work flowchart
Army & Air Force wartime special wireless units.