The Red Army (Russian: Рабоче-Крестьянская Красная Армия, Raboche-Krest'yanskaya Krasnaya Armiya; RKKA (Workers’–Peasants’ Red Army) was the Soviet government’s revolutionary militia beginning in the Russian Civil War of 1918-1922. It grew into the national army of the USSR. Since 1946, after the Second World War, it was called the Soviet Army.
Source: Wikiepdia (what else?)