Hi. Just a simple guide for the subobjective on this particular mission for anyone trying to figure out what that first sub objective is.

Now this objective is to eliminate all death squads before they reach the civilian zones. Now you could do this the hard way and let that reinforcement timer run out to spawn the death squads. You will have to be quick or those poor civilians will die.

How I did this was by forming a tough strike team of hunter tanks and riot trucks with drone operators. I took them to all three civilian zones and rescued the civilians, side note. The top civilian zone has another sub objective. It will spawn a VIP riot truck which you must protect and escort that truck to the base or you will fail that sub objective.

DO NOT SEND THE CIVILIANS TO THE EVAC CIRCLE OR THE MISSION WILL COMPLETE.

You don't want this to happen because it will prevent the spawning of the death squads. Instead, put those civilians somewhere safe in that base.

Let the timer run out and while you are waiting, build up your defences and get some units that can detect steath. I used the drone carrier, i forget the name of it. Once the death squads spawn, go out and kill them all. There you go. Sub objective is complete!