Follow Merrick to the edge of the ledge and drop kill one of the two targets below. Follow Merrick until you see the factory. Slide down and stay close to him. You'll spot a lone guard nearby so approach him and take him out silently. Follow the rest of your team inside the loading area. Upon spotting a group of guards, choose a target and shoot him; your teammates will effectively take out the rest.
Wait until the door opens then take out the two immediate guards. Go inside the building and stay close with your teammates. Continue upstairs and let your teammates take the lead. Continue the infiltration and take out any guards silently. Once you've reached a control room, sneak behind the guard and take him out using your knife. This should be your fifth stealth kill before reaching the Black Zone which will unlock the "Cog in the Machine" trophy/achievement.
Regroup by the next door and wait for it to open. Storm the next area and go hot since there will be multiple tangos. After clearing the area, regroup with your teammates and follow them through the short tunnel to the Black Zone. Go inside once the pressurized doors open and you'll find a satellite with heavy armament. There's also another Rorke file to be collected nearby.
Press the UP Dpad to activate the camera. Keep looking at the camera and just focus on the highlighted parts to upload the necessary intel to command. Once done, continue following the team to reach the computer room. Operate the vacant station to start copying the data. It won't be long until a heavily armed hostile unit breaches the computer room and sends you guys flying to the floor. Take out the enemies and stay in cover as you clear the immediate area. Next, lob some smoke grenades then press the Right DPAD to activate your thermals. This will allow you to see the body heat of your enemies. The smoke will cover your movements so use this distinct advantage to overpower the enemies. The smokescreen won't last that long so remember to unequip your thermal if the enemies are already shooting at you. Be careful not to stray too far ahead since there will be reinforcements carrying riot shields.
Push forward towards the upper room. Prioritize taking out the enemies on the ledges since they have the elevation advantage. Clear all enemies nearby then proceed upstairs. Reinforcements will arrive right before you enter the next room. Engage them on sight and clear the room. Continue following your teammates until you reach the door by the rooftop. Keep your weapon ready and shoot as soon as the door opens. There's a lot of hostiles waiting in the other side of the door. You can flank the enemies by entering the door to the left and going upstairs. This ledge will also give you a good advantage against targets on the lower floor. The area has a lot of smoke so don't hesitate to use your thermal to spot enemies easily from a distance. Use your stock of smoke grenades to provide additional cover as you push forth.
After covering a good distance, the allied bombing will initiate and you'll have to make your escape in the nick of time. Stay close to your comrades until you reach the exfil truck. The enemies will pursue you so shoot at them to stop them on their tracks until you escape successfully to safety.
