Castlemartin is the largest single part of ATE P, covering about 5,900 acres (2,390 hectares) of freehold land on the Pembrokeshire Coast National Park. The range is open to all regular and territorial Army, Cadet forces, other services and some overseas forces. But in particular Castlemartin is the only UK Army range normally available for armoured units for direct-fire live gunnery exercises and associated manoeuvres, with both on-land impact areas and a large offshore safety area. The facility is therefore mainly used for so-called ‘mounted’ and ‘dismounted’ (i.e. in-vehicle and on foot) field firing up to company level; but when such exercises are not under way it is also used for dismounted ‘dry’ training (i.e. without live firing) across most of the area. It is also used by civilian organisations and research establishments.