Declassify Mission: Locust Smoke-grenade traps reduce visibility
Grab some ammo and change weapons if you like using the scattered weapons and scattered ammo boxes in the starting area. Kick the next door open and proceed to the next room. Small flying critters will attack you so dig in and take them all out. Proceed to the next door and open it to find the declassify mission skull outside.
After activating it, head to the next room and use TAC/COM often to get the outline of your surroundings and see the enemies for a few moments. After finishing all enemies, you can head to the Terrace through the opened doors in the smoke-filled room and check the bloodstains on the floor in the far corner to find a COG tag.
Replenish your ammo and grenades then continue with your teammates to the next section.