What does OS mean in FBI Files?

This page is about the meanings of the acronym/abbreviation/shorthand OS in the Governmental field in general and in the FBI Files terminology in particular.

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Governmental » FBI Files

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What does OS mean?

a mouth or mouthlike opening

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"OS." Abbreviations.com. STANDS4 LLC, 2015. Web. 1 Mar. 2015. <http://www.abbreviations.com/term/380080>.

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