The difference between Petty officer and Staff officer
When used as nouns, petty officer means a non-commissioned officer in the canadian, us and uk navy and the us coast guard, whereas staff officer means an officer that fulfills a non-combat support function, often in a headquarters or planning office.
check bellow for the other definitions of Petty officer and Staff officer
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Petty officer as a noun:
A non-commissioned officer in the Canadian, US and UK Navy and the US Coast Guard; roughly equivalent to a sergeant in the army
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Staff officer as a noun (military):
An officer that fulfills a non-combat support function, often in a headquarters or planning office.