A Regiment is a military unit, typically consisting of around 500-700 soldiers, depending on era and country.
The United States Army presently uses the brigade, instead of the regiment, for all formations except cavalry. Although every battalion or squadron is associated with a regiment for historical purposes, the only combat regiments are cavalry regiments which is attached to a corps.
In the British Army, the Regiment is for most purposes the largest "permanent" organisational unit. Above regimental level, organisation is changed to meet the tasks at hand. Because of the permanent nature, many regiments have long histories, often going back for centuries.
See also
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