I only noticed the extra tasks when I got back to base and was waiting for mission complete. It was MP and I didn't save or load.

I did RTB in between destroying tower #2 and #1 to resupply and recruit more AI, maybe that would affect things?

After destroying both towers you got assigned new tasks? I’m not sure how that would be possible. Were you playing in SP? I’m also wondering, so maybe I can reproduce this, did you save it and load it at all, or is there anything else you can think of that might have occurred so I can see this for myself?

Both the tower tasks were completed, but at some point I got assigned new tower tasks that I couldn't complete as the towers were already down. Anyway, I'm not too fussed. I know I completed it, I just thought you'd want to know.....

@DreadPirate Aww man, I swear I tested this. There is no order necessary to complete the mission. I know for sure it worked recently because my brother downloaded this and finished it not too long ago (as have I). I’ll take another look to see if something messed with the mission complete trigger. Basically, as long as both towers are blown up, and you are at the starting base on foot, it should fire.

I destroyed tower #2 before tower #1 and when I returned to base, I didn't get mission complete.....