Führerhauptquartier Wolfsschanze
A facility for Army headquarters was also located near Wolf's lair complex. The FBK and RSD had responsibility for Hitler's personal security within the Wolf's Lair while external protection of the complex was provided by the FBB, which had become a regiment by July 1944. The FBB was equipped with tanks, anti-aircraft guns, and other heavy weapons. Any approaching aircraft could be detected up to from the Wolf's Lair. Additional troops were also stationed about away.