Proposed Changes (fixed*)

ScriptName VMcCarranControlTowerTriggerSCRIPT

short bDoneOnce;

BEGIN OnTriggerEnter CaptainCurtisREF
    set VMS08.bCurtisInTower to 1;
END

BEGIN OnTriggerLeave CaptainCurtisREF
    set VMS08.bCurtisInTower to 0;
    Set VMS08.bDisableCurtisPatrol to 0;
END

BEGIN OnTriggerEnter Player
    set VMS08.bPlayerInTower to 1;

    if (GetObjectiveDisplayed VMS08 30 && GetObjectiveCompleted VMS08 30 == 0 && bDoneOnce == 1)
        Set bDoneOnce to 0;
    endif;fixes resetquest not resetting the trigger.

    if (VMS08.bCurtisInTower && bDoneOnce == 0)
        SetObjectiveCompleted VMS08 30 1;
        if (VMS08.bCurtisAmbush == 0)
            CaptainCurtisREF.SayTo player VMS08CurtisRadio1 0 1;
            Set bDoneOnce to 1;
        endif

        ;disable the monorail guards, whom curtis has conveniently reassigned tonight.
        VMcCarranNCRTrooperMonorail1REF.Disable
        VMcCarranNCRTrooperMonorail2REF.Disable
        VMcCarranNCRTrooperMonorail3REF.Disable
        VMcCarranNCRTrooperMonorail4REF.Disable

        Autosave;
    endif
END

BEGIN OnTriggerLeave Player
    set VMS08.bPlayerInTower to 0;
END