I know nothing about callouts, but I'm certain that buildings on each map that have turrets are legitimate callouts. Maybe you should put those in there too.
Hey guys Apathy here, I've got new callouts for more maps ready to go, I'll upload them when I get home today, I kinda forgot to do that, not all of them yet, but I'm getting there
Btw, why isn't shipment on the list? Everyone knows shipment needs the most tactics and teamwork to succesfully hold the map down
One reason is that everybody vetoes Shipment. I don't even remember the last time I played that map in matchmaking. It might have been six months, and I play COD4 every day.