This territorial division type was utilised in the USSR to provide a more efficient management of army units, their training and other operations activities related to combat readiness.
First military districts in the USSR begun with the formation of the first six military districts (Yaroslavsky, Moskovsky, Orlovsky, Belomorsky, Uralsky, and Privolzhsky) on 31 March 1918 during the Russian Civil War to prepare substantial army reserves for the front.
Abbreviation of 17 military districts of the USSR at the beginning July 1940: Formations in the territory of Khabarovsk and Primorsky Krai were combined into the 1st and 2nd independent Red Banner Armies, which since January 14, 1941 were reformed into the Far Eastern Front.
The number of military districts varied depending on the circumstances and with the evolution of the Soviet Army.
At the end of the 1980s, immediately before the dissolution of the Soviet Union, there were sixteen military districts, within three to five main groupings: