Technically, units themselves do not specify which side they belong to.
It's defined by the unit's group's side.
So until now it's been perfectly possible to add eg. "OPFOR" units to a BLUFOR group, but now they kill each other if they don't "really" belong to the group's side.
Even the player treats them as enemies (Aiming at them with any unit selected will show the target crosshair).
_group = createGroup opfor; for [{_i = 0}, {_i < 30}, {_i = _i + 1}] do { _group createUnit ["B_Soldier_F", [getPos player, [vectorDir player, 30] call BIS_fnc_vectorMultiply] call BIS_fnc_vectorAdd, [], 0, "NONE"]; }
I've tried giving BLUFOR units opfor uniforms on to see if it was just due to the uniforms, but they won't fire at BLUFOR units disguised as OPFOR.
Confirmed, but I think it has to do something with the way the units are being spawned.
When placing an OPFOR soldier, and making him the group leader of a blufor rifle squad while setting his presence to 0 it's working just fine.