The designation Non-Commissioned 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.
An example would be something small like a squad leader who may have 6-12 people under their command. Another might be a platoon sergeant who can have 45-70 people under their command.
Generally, an NCOIC is both an administrative leader as well as a combat leader.
Only NCOs and SNCOs may serve as NCOICs. In the United States Air Force enlisted members in the grades of E-1 through E-4 cannot hold the position or title of NCOIC until promoted to the grade of E-5 and above.
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The original article can be found at Non-Commissioned Officer in Charge and the edit history here.