After taking out the tank with an explosive the next step is to clear the town of enemies. This always results in a fail because of what seems to be some sort of time count down. There is no indication anywhere of a time in the mission. Even if there was it would be rather frustrating as the town is pretty big and it's dark.
We cant really clear that town with 3 other guys who are usually dead by now within that time. I suggest either removing the timer completely or giving us like 30 minutes to clear the town of enemies. All enemies appear to be camping inside and around various different buildings.