Go through the doors and kill the soldier to the right by shooting a Sticky Camera at the white woman statue that you see once you open the door. When you are in the view of it, make a whistling noise. When the guard gets directly in front of the camera, knock him unconscious. Then, press R1 to leave that view and shoot the unconscious guard, so he will not be woken up by another soldier. If you shoot him, a commander will come down the stairs to the left to investigate the noise. He is armed with a Czech. Shoot him, and there will not be anymore enemies for the time being. Next, jump onto the ledge directly to right of you, where the vases are located. Once on there, shoot the vases with your pistol. You have to do this twice before they are gone. Disable the turret and jump onto the ledge of the upper floor. Once there, shoot the light above you, and then turn off the IFF mode of the turret, so that when the two soldiers appear, they will be killed. Shoot out all the lights except the ones on the bottom floor, then jump onto the pipe that hangs above you by the turret. Shoot out all the lights that shine on the flags and wait for the commander and the other soldier to go over to the retina eye scanner. The commander will open the door for him, then will stand there alone facing the turret by the stairs. Shoot your pistol around where the turret is located, and he will investigate. When he leaves, get off the pipe then disable the turret. Slowly go to the corner of where the turret is by the door. Wait for the commander to return. When he is over the retina eye scanner, slowly go down the first flight of stairs and shoot a Sticky Camera in the corner where you were just at. Make a noise, and he will go to that corner. He will wait there and look at it, but will not stay there for long. Sneak up behind him and grab him. Force cooperate him to use the retina eye scanner, which will open the door. Then, take him to a corner and knock him out. If desired, you can shoot him. Next, go to the door which will automatically open and shoot the soldier at the computer. Use the computer and retrieve the data stick. Go over the far window, go up onto the table, crouch down, and slide open the window. Then, walk outside of the window and drop down to the overhang. Drop down to the ground to finish.