Objective 1: (2)

You'll begin right next to a corner. Walk around it, and you'll see a wooden gate with some chatter coming from beyond it. A truck will drive off, and a couple of enemies will be milling about.

Approach the gate and head right. You'll spot another gate door, and the game will remind you how to open doors. Press 'E' to open it. If you need a health boost, grab the health kit on the crate inside.

Head west towards the wall, then south to the next gateway. Press the use key ('E') to open it and proceed.

As you enter, you'll see a deck in front of you with a single guard patrolling. Your M1 Garand is perfect for this – line up a headshot and take him down.

After dealing with the first guard, move south until you find an open doorway. You'll hear a couple of guards chatting and playing cards. Equip your Colt .45. Aim for a headshot on one of them. Then, quickly take out the second guard. The last guard will move towards your position from the doorway, so be ready to shoot him as he advances.

Once they're all down, grab the ammo and the health pack from the table. Then, head up the stairs.

Pause at the first landing. Look southwest; you'll see a railing and two guards patrolling the upper area. Aim for a headshot on the first guard. The second guard might be a bit more alert, so if he starts firing, take cover behind the railing.

Continue up the stairs. Go past the table, stepping over the two rifles on the ground to collect 20 rounds of ammo. Keep moving forward, and you'll find a cell door. Open it to find the SAS Agent.