A detachment (from the French détachement[1]) is a military unit.
An example is the United States Army's 1st Special Forces Operational Detachment-Delta (Airborne) (SFOD-D), commonly known as Delta Force by the general public.
Detachment is also the term used as the collective noun for personnel manning an artillery piece (e.g. gun detachment).
The Army Cadet Force in the United Kingdom breaks its structure down into local detachments which usually consist of between 10 and 40 cadets.
Individual units are known as Cadet Contingents.