Hi,
allUnits is supposed to return "all persons except agents, outside and inside vehicles, created on the following sides east, west, resistance/independent and civilian only. Does not contain units of sideLogic. Dead units and units awaiting for respawn are also excluded. "
But this command returns also:
Vanilla Arma
Just place in Eden, a player, a HQ module, a requester module+virtual artillery one.
In debug console: count allUnits will return 5! : the player, the HQ entity, 3 BIS_SUPP_HQ (WEST EAST INDEP sides)
In this case, this command should return the player only!
Furthermore, the entities like BIS_SUPP_HQs (virtual support modules) are all kind of "CAManBase" !!! but not the entity of HQ module...
So _x isKindOf CAManBase filters the HQ's entity,
and you need to add something like !(_x in [BIS_SUPP_HQ_EAST,BIS_SUPP_HQ_WEST,BIS_SUPP_HQ_GUER]) to filter these suppor entities.