What does O mean in Military?

This page is about the meanings of the acronym/abbreviation/shorthand O in the Governmental field in general and in the Military terminology in particular.

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What does O mean?

oxygen, O, atomic number 8(noun)
a nonmetallic bivalent element that is normally a colorless odorless tasteless nonflammable diatomic gas; constitutes 21 percent of the atmosphere by volume; the most abundant element in the earth's crust

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"O." Abbreviations.com. STANDS4 LLC, 2017. Web. 23 Apr. 2017. <http://www.abbreviations.com/term/592946>.