You can have unique radio call signs or group names for your units / groups.
group this setGroupId ["Some name for the group"];
It is actually very simple, there is no specific name and ID number, you can make it yourself like below.
group1 this setGroupId ["Blackjack Six"]; group2 this setGroupId ["Delta 1"];
Headquarters call sign doesn't work, commented is what it returns as call sign:
PMCHQ = [ West, "HQ" ]; PMCHQ SideChat "HQ"; // crossroads PMCHQ = [ West, "BASE" ]; PMCHQ SideChat "BASE"; // base PMCHQ = [ West, "AIRBASE" ]; PMCHQ SideChat "AIRBASE"; // base PMCHQ = [ West, "Papa_bear" ]; PMCHQ SideChat "papa_bear"; // base
Would have been nice to have virtual entity as custom HQ call sign, but now you must add single unit for that side you want to create it.