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Sub-officer, or the equivalent in other languages, is a term used in many armed forces used to indicate ranks below commissioned officers. Sub-officer is equivalent to the term warrant officer in the British Commonwealth and the United States. Historically armed forces using the term sub-officer have used it to refer to more senior non-commissioned ranks, typically from sergeant upwards, but the term often covers all ranks that other forces designate non-commissioned. In navies the term is comparable to petty officer.
There is a specific rank of "sub-officer" in some armed forces, in the UK Fire and Rescue Services, and in the Irish Fire Services.