The Historical Dictionary of Signals Intelligence covers the history of Signals Intelligence (SIGINT) through a chronology, an introductory essay, an appendix, and an extensive bibliography. The dictionary section has over 300 cross-referenced entries on key personnel, SIGINT technology, intelligence operations, and agencies, as well as the tradecraft and jargon. This book is an excellent access point for students, researchers, and anyone wanting to know more about Signals Intelligence.