You should expand your thinking Killa. Bridge could be good, spawn teams closer to a tower or further away, spawn a few at mid...
Look at Pipeline for an example, some of the spawns are scattered through the building, that's greatly realistic, they're on patrol. Hospital is a big fail because the VIP is in 1 spot and escort is all lumped together as far away from the hospital as ambush is. The whole point would be to create chaos and surprise.
I agree that Collapsed Tunnel and Insurgent Camp would be very difficult but you just have to get creative