[8.4.]. Mission 4 - Area 51: Rescue

Head forward and around the corner to the right. Go up the ramp and eliminate any patrolling guards. Exit the ramp area, turn right, and go through the opening in the crates. At the end, turn right again to face a guard. Kill him, then turn and face the explosive barrel under the crates to your left. Crouch and grab the Double Falcon 2 where the barrel was. Return to the ramp, use the elevator to go up to the next floor, and kill any guards waiting at the top. Exit the elevator and head right.

Eliminate the distant guard. Turn around and go back past the elevator. Follow the catwalk to the right until you reach a large steel door. Go through it and kill any guards on the catwalk above. Be aware of guards using the elevator. Return to the beginning of the level where the crate was.

Use the Action button to push the crate. Take it back up via the elevators to the top of the catwalk. Follow the black catwalk until you see a small X carved into the steel wall on your right. Position the crate in front of this wall and shoot it to cause an explosion, creating a hole. Enter the hole and proceed through the tunnels. On the other side, kill the scientist, take his Lab Clothes, and equip them to complete the first objective. Put away your weapons.

Go left and through the first door, killing the guard inside. Take his Super-Dragon. Go through the door to the right of where the guard was. Run past the next guard and through the other door. A guard will speak to you and allow you passage. Run to the scientist in the rear right of the room. Kill any guards and scientists present, then go through the next door to complete the second objective.

Exit the room and go right into another door a short distance away on your right. Eliminate any guards here and take the key card. Continue through the next door. In this room, kill the guards and take the key card dropped by one of them. Go through the next door near the glass, turn the corner, and go through the next door to complete the third and final objective.