Non-commissioned officer; a soldier who has authority and leadership responsibilities but hasn't been commissioned as a full officer, often starting from enlisted ranks.
An acronym formed from 'non-' (not), 'commissioned' (formally authorized), and 'officer.' This military rank system emerged in European armies during the 17th century to create a middle tier between regular soldiers and official officers—the abbreviation NCO became standard in English-speaking militaries.
NCOs are often called 'the backbone of the military' because they're the people who directly lead soldiers and actually implement strategies—many generals started as NCOs. The U.S. Army has over 800,000 NCOs, making them numerically the largest leadership group in the entire military.
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