| Title: | Purple Dragon: The Origin and Development of the United States OPSEC Program |
| Note: | declassified redacted version, with author's name redacted; originally dated 1993 |
| Link: | PDF at nsa.gov |
| Stable link here: | https://onlinebooks.library.upenn.edu/webbin/book/lookupid?key=olbp57100 |
| Subject: | Vietnam War, 1961-1975 -- Communications -- Security measures |
| Subject: | Vietnam War, 1961-1975 -- Communications -- Technology |
| Subject: | Communications, Military -- Security measures -- Vietnam |
| Other copies: | Look for editions of this book at your library, or elsewhere. |
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