M42 · Postwar institutional research monograph · digitised edition

A Priceless Advantage

Intelligence sharing, partial message texts, traffic analysis and the later account of identifying AF with Midway.

Author
Frederick D. Parker · Center for Cryptologic History, NSA
Date
1993
Passage
Printed pp.20–21 and 50–51 · PDF pp.26–27 and 55–56

What has been checked

Selected page images visually inspected on 18 October 2026; full 92-page PDF retained as a research copy.

How to read it

Not a 1942 intercept. Parker explicitly qualifies the evidence for the water-shortage deception episode. Underlying intercepts and the alleged instruction to Midway have not been inspected. Broad claims about reading messages are not treated as proof of complete coverage.

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Photograph

Enlarged historical photograph

Web copy resized and compressed; original framing retained. Open image file ↗