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A non-commissioned officer (NCO) is a military officer who does not hold a commission. [1] [2] [3] Non-commissioned officers usually earn their position of authority by promotion through the enlisted ranks. [4]
Non-commissioned officers are further subdivided into "junior non-commissioned officers" (Jr NCOs), consisting of the ranks of MCpl/MS and Cpl/LS, and "senior non-commissioned officers" (Sr NCOs), consisting of Sgt/PO2. The ranks of MCpl/MS (MCpl/MS is an appointment given to a Cpl) and below are also collectively known as "junior ranks" (JRs).
The designation Noncommissioned Officer in Charge, usually abbreviated to NCOIC (or NCO I/C), signifies an individual in the enlisted ranks of a military unit who has limited command authority over others in the unit.
"Non-commissioned member" (NCM) is the equivalent term in the Canadian Armed Forces, and "enlisted rank" is used in the United States and elsewhere. The term "other ranks" is often considered to exclude warrant officers (WO), and occasionally in some militaries also excludes NCOs.
From the creation of the United States Army to 1821, non-commissioned officer (NCO) and staff non-commissioned officer (SNCO) rank was distinguished by the wearing of usually worsted epaulets. From 1775 to 1779, sergeants and corporals wore one epaulet on the right shoulder, corporals of green color, sergeants of red color. [2]
A non-commissioned officer (NCO) is an enlisted member of the armed forces holding a position of some degree of authority who has (usually) obtained it by advancement from within the non-commissioned ranks.
E-4 to E-6 are considered to be non-commissioned officers (NCOs), and are specifically called petty officers in the Coast Guard. Their sleeve insignia is a perched eagle with spread wings (also referred to as a "crow") atop a rating mark (a rating mark, is a symbol denoting their job category, with red chevron(s) denoting their relative rank below.
The main difference is in the commissioned officer ranks, where the US system recognises two ranks at OF-1 level (O-1 and O-2), meaning that all O-x numbers after O-1 are one point higher on the US scale than they are on the NATO scale (e.g. a major is OF-3 on the NATO scale and O-4 on the US scale).