The standard operational units are structured as follows, although various units have their own structure, conventions, names and sizes.

Type of Unit Division Brigade Battalion/ Regiment Company/ Squadron Platoon/ Troop Section Fire Team
Contains 2–3 Brigades 3–5 Battalions 5 Companies 3 Platoons 3 Sections 2 Fire Teams 4 Individuals
Personnel 10,000 5,000 550–750 100 30 8–10 4
Commanded by Maj-Gen Brig Lt Col Maj Capt, Lt or 2nd Lt Cpl LCpl

Corps are made up of two or more divisions, but are now unlikely to be deployed as a purely national formation due to the size of the British Army; e.g., the ARRC.

In place of a Battalion, a task-specific Battlegroup may be formed. A battlegroup is grown around the core of either an armoured regiment or infantry battalion, and has other units added or removed from it as necessary for its purpose. It results in a mixed formation of armour, infantry, artillery, engineers and support units, typically consisting of between 600 and 700 soldiers under the command of a Lieutenant Colonel.

A number of elements of the British Army use alternative terms for battalion, company and platoon. These include the Royal Armoured Corps, Corps of Royal Engineers, Royal Logistic Corps, and the Royal Corps of Signals who use regiment (battalion), squadron (company) and troop (platoon). The Royal Artillery are unique in using the term regiment in place of both corps and battalion, they also replace company with battery and platoon with troop

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