Remove any limitation on backup calls

Greetings to all, I would really like to be able to call the zombies or the SWAT team as many times I want, regarding the same war scene/situation.. since the enemies are spawning countless...

If this can't be done, then to add to the number of the mentioned backups that arrive.. maybe..? though I would prefer the first..

Should the zombies-backups or in general not be killed unless only with sonic weapon, fire and/or explosion..?

Thanks for reading this!
 
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