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Spelling correction of Petaluma. |
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These designators were used from the 1930s through the end of [[World War II]]. They were replaced after the end of the war with [[SIGAD]]s (SIGINT Activity Designators), which are similar in format and application.
Two facilities, Vint Hill and [[Training Center Petaluma#History | Two Rock Ranch]], were operated by the [[NSA]] until the 1970s.<ref name=Stephen>{{cite book|last1=Budiansky|first1=Stephen|title=Code Warriors|date=2016|publisher=Alfred A. Knopf|___location=New York|isbn=9780385352666|pages=301}}</ref>
==General Format==
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