>Don't forget one other important thing at the time: Radios were not
>general issue, most of the infantrymen wouldn't even have one.
>

even as recent as a few years ago, only elite units like the seals would have squad level radio communications.

In WW2, IIRC, maybe your platoon or company commander had a radio link back to your parent unit; it certainly wasn't originally intended to provide links to other units. That was one of the things they learned during ww2, how usefull it could be for the grunts to be able to pass information such as forward spotting of artillery or look out for the panther at 2 o'clock, etc.