Declassify Mission: Heavy Locust and Rager offensive
At the start of the section, take out all enemies in the area. Once done, proceed until your objective changes.
As you make your way to the ruined building where the declassify mission skull is, you should see a COG tag skull on the broken wall to the left. Check the big pile or rubble to the left to find the COG Tag there.
Proceed to the ruined building and activate the declassify mission if you want. Head to the door and have the bot weld it open. As it's doing its job, set up a perimeter to defend it. There's a Ranged Sentinel nearby so you can deploy it in one of the pathways to help you funnel the enemy forces, preferably in the main ramp beside the bot.
If you accepted the optional mission, be prepared for a heavy Rager attack. You may want to use the one-shot and take position along the main ramp. Maulers will also join the fray so you have to be careful not to get surrounded. The best position will be the room to the right since it is elevated and the enemies won't reach you immediately. You can also wait for them to arrive at the only opening.
After surviving the attack, regroup with the bot to complete the section.