Radios in Red Thunder

Just got Red Thunder, and I can't help but notice that there are basically no radios on the Soviet side of things. In fact, in the mission I most recently played there was not a single radio to be found in the entire infantry battalion except for ones installed in vehicles. That's fine, I suppose ol' Joey Steel didn't wanna splurge on a few radio operators, but I am confused how Soviet comms are supposed to work, doctrinally speaking.

How do all of you organize your forces with so few radios? And also, bonus question, how are my platoon commanders able to call in fire support without a radio?