You make AI respawn with a pawnfactory you add one to the map. first you doubleclick on it. go to Events, and change the tag to TrandoHorde1 or somethin like that. then you set up a trigger to make that event happen. then go to the factory's properties, and xpand Factory. set Capacity to a big number like 50. go to prototype set it to whoever you want. to make them run out, go to PatrolMode and change it to PM_Once. set PatrolPriority to .8 or.9 or 1. click on PatrolRoute. hit Add. in the new thing that comes up, you see a thing called Node. Single click on a pathnode in your map then go to Node, and hit Use.