Enfield Bridge
Starting in the middle of the map at the round section with the turret, walk towards the Academy and up to the edge of the broken bridge. On the left side, behind the large statue will be this COG Tag.
Courtyard
After meeting the first Rager, you'll enter a room and fight off several more ragers. Before leaving, head off to the left (from the front door) and you'll find a hallway which is mostly blocked off. There's one room open in this hallway and if you enter the room, you'll find this COG Tag on the floor in front of the window.
R&D Labs
There are two rooms in this area where you fight locust. The main room is mostly open but there's a side lab with a lot of tables. If you enter this room and head to the very end of it, you'll find this COG Tag on the floor in the corner.
Monroe Commons
After the first battle, you'll be able to enter rooms on the right side. If you enter the first one (the room on fire), you'll see a Crimson Omen on the wall. Turn left and enter the next room. There will be two sets of desks formed into rings. You want to go to the further set of desks and you should find these COG Tags on the floor near them.
Atrium
You'll enter the atrium and have to fight a large group of locusts. After the fight, check the locker room on the right side. Just inside this room, turn aorund and look behind the door to find this COG Tag.
Crash Site
From your starting point, turn around and walk up the stairs. The COG Tags are at the top of the stairs off to one side. It really is that easy.
