The Grenzkommando Mitte (GKM) (Border Command Center), with headquarters at Berlin-Karlshorst, manned the crossing points into West Berlin and guarded the entire border perimeter surrounding West Berlin. The GKM consisted of six frontier troops regiments, two training regiments and some smaller support units. Unlike the Border Commands North and South, which fielded border regimens in full-sized border battalions, the border regiments of the Border Command Center were of reduced strength. They had the same complement of combat support and combat service support units, but the border guards were organized in companies directly subordinated to the regiments. A Bordercrossing Security Regiment (the "GÜST Sicherungsregiment SiR-26 "Walter Husemann"") was disbanded in 1985 and its forces dispersed among the border regiments, as the centralized location made the deployment of security details through the city to the various border crossings around West Berlin difficult. An artillery regiment (the "Artillerieregiment AR-26 "Otto Nelte"") was formed on March 17, 1971 with the mission to provide artillery support in case a war erupts and the GDR launches an offensive operation to capture West Berlin. It was put under Border Troops command to circumvent the restrictions for military forces in both parts of Berlin and was a source of constant tension between the GDR and its Soviet ally on one hand and West Germany and its western allies on the other. In the final years of its existence the German Democratic Republic sought warming up of its relationship with the Federal Republic of Germany and as one of the signs of goodwill the regiment was transferred to the Land Forces of the National People's Army on November 1, 1985(becoming the "Artillerieregiment-40") and directly subordinated to the Chief of Artillery and Rocket Forces.