1 - As you enter the tunnels, go left as instructed. After the patrol passes, kill the guard standing at the monitor, and go straight across to find the Intel on a crate just to the right of the cave entrance.

2 - The Intel is to the left on a desk right before you go outside from the tunnels.

3 - After going across the ridge, the Intel is in an alcove, on a crate.

4 - The Intel is on the desk with soda cans after you breach the room, near where your ally is working on the computer.