There is no more efficient and versatile infantry in game than Bar Riflemen. But in any case, Soviets do NOT need something like that.
They also do have something quite similar and useful.
If you build an outpost and park the Medic truck there, you have a forward base to retreat to, reinforce AND heal. All you have to do, is drive the medic truck to different outposts on the map and gain the same advantage.
If you're really sneaky, you can send the Medic truck on the other side of the map so you can move your troops faster to react to an attack or launch an attack from that side faster than your opponent expects.
Be creative...