Which mission are you playing? The mission maker may have set it up so there is very little enemy to begin with and it can take several hours before you'll run into any serious resistance.

Remember the whole point of a counter insurgency scenario is *not* to have lots of enemy everywhere - they will avoid you and you need to spend a lot of time monitoring civilian movements and patrolling to build an intelligence picture so you can start to locate their HQ's. It's not easy and takes a lot of patience and coordination.

If you want more shooty shooty, you can set the Mil Placement modules to spawn more AI in a smaller TAOR at mission start, or even just use regular Occupation AI Commander.