Sorry in advance for making two threads back to back, but I was just curious to get some feedback.

I've been developing an insurgency mission for a little while now, but I've been curious about how others set up their AO markers. Personally, I have one giant AO marker for the entire area where insurgents are active. Is this the best way to go about creating an AO, or should I create a bunch of smaller AOs, like per town?