Clear the Command Deck and stop the attack on the Sephora (part 2) | Mission 2: Battle for Sulaco A: CM Guide
Last update: 11 May 2016
Continue going through the command deck, choosing the passage close either to the left or the right turret. Your current destination is the captain's bridge illustrated above, where, naturally, you'll be welcomed by enemy fire. Shoot from behind a cover, using the motion tracker to detect the enemies.
I recommend eliminating the enemies without moving away from the lower part of the room, because there is a third turret at the main entrance and you might easily get caught in its fire range. I don't recommend wasting supplies on trying to destroy it; instead go through one of the side rooms (left or right) so as to get behind it and deactivate it safely.