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A non-commissioned officer (sometimes spelled noncommissioned officer and shortened to NCO or non-com (US)), called a sub-officer in some countries, is a military officer who has not been given a commission. Non-commissioned officers, in the English-speaking world, usually obtain their position of authority by promotion through the enlisted ranks.
NCO's usually include all grades of corporal and sergeant; in some countries, warrant officers also do the same things as NCOs. In the navy and depending on the country, some or all grades of petty officer may be counted as NCO's. There are different classes of non-commissioned officer, including junior non-commissioned officers (JNCO) and senior (or staff) non-commissioned officers (SNCO).
- "non-commissioned officer – definition of non-commissioned officer by Macmillan Dictionary". Macmillandictionary.com. http://www.macmillandictionary.com/dictionary/british/non-commissioned-officer. Retrieved 2012-07-10.
- "NCO – Definition from Longman English Dictionary Online". Ldoceonline.com. http://www.ldoceonline.com/dictionary/NCO. Retrieved 2012-07-10.
- "Definition of non-commissioned – Oxford Dictionaries (British & World English)". Oxford Dictionaries. http://www.oxforddictionaries.com/view/entry/m_en_gb0561930#m_en_gb0561930. Retrieved 2012-07-10.
- "Chambers | Free English Dictionary". Chambersharrap.co.uk. http://www.chambersharrap.co.uk/chambers/features/chref/chref.py/main?query=non-commissioned+officer&title=21st. Retrieved 2012-07-10.