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A detachment (from the French détachement) is a military unit. It can either be detached from a larger unit for a specific function or (particularly in United States military usage) be a permanent unit smaller than a battalion. The term is often used to refer to a unit that is assigned to a different base from the parent unit.
An example is the United States Army's 1st Special Forces Operational Detachment-Delta (Airborne) (1st SFOD-D (A)), commonly known as Delta Force by the general public.