Well I saw the tute on custom call signs but given the amount and organization of my friendly units, it still wont suffice.
So what I am trying to have is no unit identification in the radio text, no "Alpha Black 1:" etc.
If I dont have any then I am free to embed at the beginning of the radio chat text my own designation like "D/1/1"
If I use "" in my stringtable for the group names and colors, OFP will still put the number designation in the beginning and it will look funky.
So basically an ANONYMOUS radio call would be what I need.
I am at work so I can't confirm, but how did BIS do the radio calls from that guy in Resistance who took over the air waves. I don't think he had a call sign. Hmm...