The difference between Field officer and Petty officer
When used as nouns, field officer means a (para)military commissioned officer who holds a field grade, ranking under general officers but above lower grades and fit to command medium-size units on the field, such as a battalion or regiment, whereas petty officer means a non-commissioned officer in the canadian, us and uk navy and the us coast guard.
check bellow for the other definitions of Field officer and Petty officer
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Field officer as a noun:
A (para)military commissioned officer who holds a field grade, ranking under general officers but above lower grades and fit to command medium-size units on the field, such as a battalion or regiment; or a non-army equivalents in rank.
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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