effectiveCommander – Talk
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This command doesn't return the effective commander immediately. when this unit dies, it takes few second to make change. on the other hand, the following script, runs slower (~ 0.01 ms) but will return the effective commander immediately:
where vehicle is the same object as for effectiveCommander vehicle
''vehicle'' call {
  if (!(typeof _this isKindOf "air")) exitWith { 
    call {
      if (alive commander _this) exitWith {_commandingUnit = commander _this};
      if (alive gunner _this) exitWith {_commandingUnit = gunner _this};
       _commandingUnit = driver _this};
    };
    _commandingUnit = driver _this;
_commandingUnit
 };