3 Dog Tags
3 Audio Logs
Vasquez's Smart Gun
Continue following the path until you found the first group of dismembered marines. Continue forth until you spot an enemy drop ship. Stay out of sight then continue forth. Look at the sheet on the ground to find the first dog tag of the mission.
Proceed along the path and take out more xenos along the way. Get past the ship wreckage and fight more xenos. Push forward and look for a green cache to the left, before entering the tunnel. There's another dog tag there.
Go through the tunnel and make your way outside. Fight your way to the large cavern ahead. You'll encounter smaller, acid-spitting xenos ahead. Your Assault and Battle Rifle can effectively take them out from a distance. Proceed along the path and carefully take out the spitters as they appear. Continue until you exit the cavern and see the Wey-Yu facility ahead.
Head inside the facility and follow Bella and Oneal. Fight through more xenos as you exit out of the first facility. Continue to the next abandoned building.
Continue upstairs and two lurkers will ambush you in the next room. Kill them then jump down the opening on the floor. Carefully hop on the platforms then turn around to the right to find an audio log.
Exit the building and enter the next facility. As you continue to the main hall, an auto-turret will activate. Get past it and turn to the left to find it. Disarm it and you should find another audio log on the yellow supply cache ahead.
Continue ahead and you'll encounter a couple more turrets. Run past the second turret then enter the vent to the left. This will take you to an enclosed room. Jump on the crates to jump over the next room. Open it and you'll be able to get behind the second auto-turret. Disable it then run straight ahead the corridor. At the end you'll find a sealed door. Cut it open and grab the full body armor and last audio log in the next room.
Abandoning Facility message
Backtrack to the previous turret you disarmed then cut open the door beside it. Disarm the other auto-turret for your teammates to continue. Wait for Bella to open the door then open the next door to the control room. Join Oneal while he tinkers with the terminal. The last dog tag is found on top of the same terminal he's operating.
After the mission update, wait for Bella to open the other door. Continue outside and take out the PMCs holding position there. Go through the next door and go downstairs. Open the next door and continue ahead. You'll find Vasquez's Smart Gun in the left corner of the room, beside the lift.
Exit the room and fight your way through both human and xeno enemies until you reach the elevator. If you acquired the smart gun earlier then you'll be able to cut through the opposition in a breeze. The mission will be complete after reaching the elevator.