<Tr> <Td> Seaman </Td> <Td> Private or gunner or trooper </Td> <Td> Aircraftman or airman </Td> </Tr> <Tr> <Td_colspan="3"> Talk View </Td> </Tr> <P> A non-commissioned officer or noncommissioned officer (NCO, colloquially non-com or noncom) is a military officer who has not earned a commission . Such is also called sub-officer in some countries . Non-commissioned officers, in the English - speaking world, usually obtain their position of authority by promotion through the enlisted ranks . In contrast, commissioned officers hold higher ranks than NCOs, have more legal responsibilities, are paid more, and often have more non-military training such as a university diploma . Commissioned officers usually earn their commissions without having risen through the enlisted ranks . "Mustang" is a slang term in the United States Armed Forces used to refer to a commissioned officer who began his or her career as an enlisted service member . </P> <P> The NCO corps usually includes all grades of corporal and sergeant; in some countries, warrant officers also carry out the duties of NCOs . The naval equivalent includes some or all grades of petty officer, although not all navies class their petty officers as NCOs . There are different classes of non-commissioned officer, including junior non-commissioned officers (JNCO) and senior (or staff) non-commissioned officers (SNCO). </P>

What is the difference between an officer and a non commissioned member
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