Amount of enemy's needs upping a little bit otherwise great mission
It depends where you go and how long after the mission start.
Because it is an insurgency, it starts off with low numbers of enemy. But as they recruit civilians and arm them, the numbers really ramp up. If the mission is left running for 24 hours+ the whole map will be infested with bad guys out to kill you!
So to start with, go on foot patrols, looking for IED's and the odd contact here and there, but keep a watch for suspicious activity. Then after a while the enemy will get really numerous and you'll be forced to go out in larger numbers with heavier fire support just to stay alive.