How to get Enemy Intel 1:Immediately after the training level, you get flown to a cargo ship and dropped off. Once you're on the ship, shoot the enemies through the window, then follow the soldiers through the door and down the stairs. Around the corner and down the hall, you'll find a drunken enemy and to your immediate right, you'll also find two enemies sleeping inside a room. Kill them all. As you enter the room with the dead sleeping enemies, to your right you'll find Intel 1. Get it and you're good to go.
Act I, Crew Expendable
How to get Enemy Intel 2:After you get Intel 1, follow the soldiers out the door and down the stairs into the open area. You'll start to see some action between your allies and enemies. Keep following your allies as they know exactly where to go. You'll come across a long hallway (see video) with a bunch of enemies shooting at you. Kill them and keep walking. Make a left at the door, waiting until the soldier tosses a flashbang into the room. Get in there and blast away at the enemies. Go down the stairs and you'll find Intel 2 on the floor to your left. Acquire it and move on!
Act I, Blackout
How to get Enemy Intel 3:At the start of the level "Blackout", go forward through the swampy area and you'll soon see two enemies and a shack to your left. As soon as Captain Price says "Weapons free," kill the enemies. After they're dead, head up to the shack when you'll find two more enemies and take them out. Intel 3 is to your right. Grab it!
Act I, Blackout
How to get Enemy Intel 4:Intel 4 is in the same level as Intel 3, but still quite a ways away. To get Intel 3, you'll have to keep heading towards the objection marker. You'll see lots of action when following your allies. At one point you'll come up to a big house — when a soldier says "cut the power", you'll know you're at the right house. Turn on your night vision goggles and head inside. Once inside, kill the enemies as you see them. Keep going forward and go up the stairs. Make a left circle and go forward a few steps. Make another left into the bathroom and straight ahead will be Intel 4.