During the Soviet period, Azerbaijan was part of the Transcaucasus Military District, whose forces in the republic were commanded by the 4th Army. The 4th Army consisted of three motor rifle divisions (the 23rd Guards Motor Rifle Division (MRD) at Ganja, the 60th Motor Rifle Division at Lankaran, and the 295th Motor Rifle Division in Baku) and army troops that included missile and air defence brigades and artillery and rocket regiments. Azerbaijan also hosted the 49th Arsenal of the Main Agency of Missiles and Artillery of the Ministry of Defense of the Russian Federation, which contained over 7,000 train-car loads of ammunition to the excess of one billion units. In addition, the 75th Motor Rifle Division, part of the 7th Guards Army, was in the Nakhchivan Autonomous Republic