The Company (military unit) reference article from the English Wikipedia on 24-Apr-2004
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Company (military unit)

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A company is a military unit, typically consisting of about 100-200 soldiers.

In the United States military, it refers to a group of 150-300 soldiers formed into three to six platoons, and typically commanded by a captain. Several companies form a battalion.

In the US and Canadian militaries (at least), individual companies are identified by letter - "B company", "company K", and so forth. The letters are often pronounced using the NATO phonetic alphabet or formerly the Joint Army/Navy Phonetic Alphabet, resulting in names such as Charlie Company and Easy Company, some of which have become familiar.

See also: Military structure