Classified Intel Acquisition

Videos

The game will offer two ways of completing this mission. One is by finding the undercover agent or using the west watchtower to signal him. However, there's an easier way of doing this and will unlock the "Infiltration" trophy/ achievement at the same time. Watch the videos below:

Infiltration

Exfiltration

Text Walkthrough

There are two important NPCs here. First is the truck driver. Make sure to tag him while he's leaving the truck inside the administration building. Next is the soldier who has the Classified Intel Tape. He's located inside the boiler room. In any case you mess up and they detect you, just put them to sleep and kick them to wake them up. They'll be on alert but will resume their normal routine after a short while.

When the mission starts, wait until the truck stops inside the administration building. Quickly leave the truck and wait for the driver to leave. Make sure to tag him first then go around the building.

Climb up the ladder leading to the Central Tower. Go there, shoot the security camera and pick up the casette on the table.

Leave the tower and jump to the ground. Make sure your way the boiler room and you'll find the lone, bald guy there. Sneak from behind and restrain him. While restraining him, interrogate him and he'll drop the casette. Knock him out and grab the cassette. Now make your way back to the truck and wait for the driver to return. Lie on your stomach to prevent other soldiers from spotting you and wait until the truck leaves the mission area. Mission complete.