Soviet Mechanized Infantry?

[Pzrshrek]

Yes. But they didnt use halftracks apart from some rare lend-lease APC's:

Soviets recreated division-sized mechanized infantry units termed Mechanized Corps, usually consisting of one tank brigade and three mechanized infantry brigades, with motorized supporting arms. They were generally used in the exploitation phase of offensives, as part of the pre-war Soviet concept of Deep operations. The Soviet Army also created several Cavalry mechanized groups in which tanks, mechanized infantry and horsed cavalry were mixed. These also were used in the exploitation and pursuit phases of offensives. Red Army mechanized infantry were generally carried on tanks or trucks, with only a few dedicated Lend-lease APCs.