[8.1]. Mission 1 - dataDyne Central: Extraction (3)

Access the Foyer Elevator: Equip Night Vision Goggles. Kill the guard behind the desk with a headshot (a critical hit to the head). Find and open the hidden door to the right of the desk, kill the guard inside, and grab the ammo. Continue right, kill the next two guards. Work around the main room, killing guards until you reach stairs with guards at the top. Kill them, go up the stairs, turn left, and enter the elevator.

Defeat Cassandra's Body Guards: As the elevator ascends, remove Night Vision Goggles. Exit the elevator, go right, and around the corner to kill the guard. Enter the doors behind him and follow the hallway to two of Cassandra's body guards. Kill them, take their shotguns and cartridges. Enter the single door at the end of the hallway and kill another body guard.

Activate office elevator: In the room with the last body guard, find the control panel on the desk and press the B button to activate the office elevator.

Defeat Cassandra's Body Guards (Continued): Backtrack to the first elevator (not the one just used) and go up one floor. Go right from the elevator, around the corner to kill helmeted guards. Enter the door to the left of the guards. Work through the inner office, go left through the hidden sliding door, and through the next unlocked door to find and kill another body guard. Proceed through the next door. Go straight, clear the room ahead of any more body guards. Return to the elevator and use the door next to it. Go up the stairs to the next floor. Go right and kill the guard arguing with scientists, letting the scientists run away. Take the Rocket Launcher.

Destroy dataDyne Hover Copter: Turn to face the large window to your left. Equip the Rocket Launcher and wait for the Hovercopter outside. Shoot it when you have a clear shot.

Defeat Cassandra's Body Guards (Continued): Turn right and use the door near where you acquired the Rocket Launcher. Take the stairs to the top floor and go through the steel grate. Outside, kill the remaining bodyguards.

Rendezvous at helipad: Take the ramps back to the helipad to complete the final objective.