The gun group is commanded by the Battery Captain (BK), the battery's second-in-command. However this position has no technical responsibilities, its primary concern is administration, including ammunition supply, local defence and is based in the "wagon-lines" a short distance from the actual gun position, where the gun towing and logistic vehicles are concealed. Technical control is by the Gun Position Officer (GPO, a lieutenant) who is also the reconnaissance officer. The battery has two Command Posts (CP), one active and one alternate, the latter provides back-up in the event of casualties, but primarily moves with the preparation party to the next gun position and becomes the main CP there. Each CP is controlled by a Command Post Officer (CPO) who is usually a Lieutenant, 2nd Lieutenant or Warrant Officer Class 2. Gun positions may be "tight", perhaps 150 × 150 metres when the counter battery threat is low, or gun manoeuver areas, where pairs of self-propelled guns move around a far larger area, if the counter-battery threat is high.