Amador Park
Just before the end of the level, you'll fight some Grubs and off to the right will be some stairs. By the base of the stairs, you'll see the Crimson Omen. The COG Tags are NOT up the stairs but off to your right between the stairs going up and the stairs leading down to the previous area.
Magadha Villa
At the end of the section, go straight past the waypoint to the end of the street. Turn around and then hug the right wall. You'll find the COG Tag on the ground in a corner behind a lamp post.
Soleno Villa
Just before the last turn right to get to the end of the section, instead go straight and you'll see a bunch of cars parked at a barrier. On the left side of the cars will be the Crimson Omen and on the right side just next to the cars will be your COG Tags.
Windward Way
Towards the end of the Windward Way will be a section with a hollowed out blue shipping crate on the right. Go through the crate and just as you exit, on the left against the wall will be this COG Tag.
Risea Estate
After you've cleared the area, cross the courtyard to get to the building. Follow the building all the way to the left and you'll find a ramp that leads downward to a garage. The COG Tags are in the left back of the garage.
Guest Bungalow
After you get past the wires and turrets, you'll enter a building and then be facing across a street at another building. On top of the far building will be a Grub with a mortar and that's your eventual target but for now, cross the street and enter the room on the bottom floor. Just inside, turn the corner to the right and you'll find the Tags on a shelf.
Elliott's Mansion
These Tags are a little out of your way. When enter the foyer proper where you need to fight off waves of enemies, walk along the right side of the top level. At the end, turn left and you'll find the point where the One-Shots have been setting up. Go across this perch. Stick to the railing on the left and you should see the COG Tags on the floor by the railing just before entering the next hallway.
