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What does O4 stand for? 

What does O4 mean? This page is about the various possible meanings of the acronym, abbreviation, shorthand or slang term: O4.

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O4

Officer grade: Captain or Colonel

Governmental » Military

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O4

Officer grade: Commander or Lieutenant Colonel

Governmental » Military

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O4

Officer grade: Lieutenant Commander or Major

Governmental » Military

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    BP
    A Bilateral Pneumonia
    B Borderline Personality
    C Blood Poisoning
    D Blood Pressure

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