Chapter 4: Onyx Point
COG TAG 22: FORTRESS
Once have made it to the top of the bunker, and cleared it out of Locusts, head for the exit but make right before continuing. Go through the door on the left at the far wall and the tag will be on the ground behind an onyx ammo pack.
COG TAG 23: CONTAINER TERMINAL
When you have cleared the area of Locusts with the Silverback, before going through the door to the exit to continue, go up the set of small stairs found to the right just before it, and grab the tags off the ground behind the sandbags.
COG TAG 24: MOTOR POOL
When you first go outside, go up the first hill and you will see the Blood Omen on the wall to the left. Look behind that wall and the tag will be on the ground there.
COG TAG 25: THE CLIFFS
Right as the mission begins, walk outside and head up the set of stairs on the left side. Once at the top, go to the left to find the COG tags on the ground.
COG TAG 26: CENTRAL BASE
When you come outside on the upper floor, go down the stairs to the right to get down to the ground. When you reach the bottom of the stairs, immediately turn to the left to see the tags on the ground beside the stairs.
COG TAG 27: CENTRAL CONTROL
Right at the start of the mission, go forward to the stairs on the other side of the hole in the ground and make a right to the hallway there. Make another right and go all the way to the end to find the tags there on the ground.
COG TAG 28: BEACH
At the start of the mission, go up the first set of stairs you come across and immediately look to the left on the ground to find the tags.
