During WWII,the Soviet Army never had a priority for APC's and therefore the only way a sizeable infantry could really keep pace with armored advances was to have a couple infantry squads mounted on the outside of each T-34 and KV tank if possible. Their role was to dismount the tank when on first contact closing in on the enemy. Many never got the chance as German machinegunners weren't stupid and focused a lot of their fire on advancing Soviet armor.
In any case,their life expectancy was exceedingly short........................
