SpawnOPFORCas = function(zone, spawn, targetGrp)
    local casZone = AI_CAS_ZONE:New( zone, 100, 1500, 250, 600, zone )
    local casGroup = spawn:Spawn()
    targetGrp:HandleEvent(EVENTS.Dead)
    function targetGrp:OnEventDead(EventData)
        local grp = EventData.IniGroup
        local initGrpSize = grp:GetInitialSize()
        local currentInZone = grp:CountInZone(zone)
        if currentInZone / initGrpSize <= 0.3 then
            grp:Destroy()
            casZone:Accomplish()
            casZone:__RTB(5)
            --casZone:RTB()
        end
    end
    casZone:SetControllable( casGroup )
    casZone:__Start ( 1 )
    casZone:__Engage( 2 )
end