Mechanised corps (Soviet Union)
The mechanised corps were a Soviet armoured formation used prior to the beginning of World War II and reintroduced during the war, in 1942. == Pre-war development of Soviet mechanised forces == In Soviet Russia, the term armored forces (thus called Bronevyye sily) preceded the mechanised corps.
Source: Wikipedia — Mechanised corps (Soviet Union) (CC BY-SA 4.0)