Transbaikal Military District
The 17th Army was formed from the 1st Army Group of the Transbaikal Military District on 21 June 1940. From 1941 to 1945, the army assumed a general defensive posture, including within Mongolia. On 22 June 1941 it included the 57th and 61st Tank Divisions, and the 36th and 57th Motor Rifle and 82nd Rifle Divisions. On 15 September, the Transbaikal Military District became the Transbaikal Front.