Though it is well known that US naval intelligence contributed greatly to the Allied victory in the Pacific War, less is known of the dedicated men who worked so long and hard to understand a complicated language and foreign culture. Each of the 59 entries has a photograph of the officer; an excerpt from his entry in The Lucky Bag, the Annapolis yearbook of the Naval Academy; and a discussion of his life and how he contributed to the effort to crack Japan's codes. These interesting details help readers understand the difficult but ultimately successful analytical work and the bitter bureaucratic battles. As expected, the book is extensively documented with excerpts from various sources, footnotes, bibliography, and references at the end of each entry. The author, a retired associate director of the McDermott Library at the US Air Force Academy, has written other books on intelligence topics. This unique tool is a much-needed tribute to these unsung heroes and can be used when researching the pre–WW II era and the attack on Pearl Harbor. Also available in electronic format, it is most suitable for the reference collections of academic or large public libraries. Summing Up: Recommended. Undergraduates through researchers/faculty; general readers.