In Gears of War 3 for the Xbox 360, there are 15 COG Tags you can collect that are hidden throughout the game.
The hidden COG Tags are available in all difficulty settings in Arcade and Standard. Collecting all COG Tags will unlock the Remember the Fallen achievement worth 15 gamer points.
Here are all 15 COG Tag locations.
COG Tag 1 – Prologue “Troubled Past”
At the beginning of the game when you gain control of Marcus, you’ll find it in the door to your right.
COG Tag 2 – Act 1: Chapter 1 “Anchored”
After killing all of the Lamberts on the deck, look for a metal container with the COG logo. Behind the container, look above for a dead body. Shoot the body for the COG Tag to drop.
COG Tag 3 Act 1: Chapter 3 “Homecoming”
Before using the Loader Mech and after the Grocery area, you will get to a spot where you have to transport some food. When you get to your drop off point, you will see the COG logo sprayed on a wall leading to a room. It’s on a desk in that room.
COG Tag 4 – Act 1: Chapter 4 “Helping Hand”
As you are heading to the Stadiu mafter you get out of the Camp’s warehouse, look for the COG logo on a brick wall. It’s located on a dead man on the far right side.
COG Tag 5 – Act 1: Chapter 6 “Hanging By A Thread”
Once you enter the Locust outpost, look for a COG logo near a van on the right side. Go down the ladder nearby, and you’ll find it on the path below.
COG Tag 6 – Act 2: Chapter 1 “Shipwreck”
As you are fighting the at the beach near Chairman Prescott, look beside where he is lying down and you’ll find the tag behind the cargo there.
COG Tag 7 – Act 2: Chapter 3 “Forced Entry”
Kill all five guards without them sounding the alarm. Once all five guards are dead, a side door will open. Go down the lower path to find the tag. Sniping is recommended here.
COG Tag 8 – Act 2: Chapter 6 “Airborne”
After you kill the four Reapers in Dizzy’s fort, go across the street and look for a destroyed building. The tag is on the second floor of the building.
COG Tag 9 – Act 3: Chapter 2 “Rescue”
During the Lambent Berserker fight, the tag is near the gate on the floor.
COG Tag 10 – Act 3: Chapter 4 “Ghost Town”
While tracking down the crazy guy, you will come across a Fresh Meat stand in the back near a COG logo. Look near the Fresh Meat stand the tag.
COG Tag 11 – Act 4: Chapter 1 “Ashes To Ashes”
After destroying the Polyps that the Ash Man drops, and before checking out the building that Sam suggests, look for a COG logo on the far left building. The tag is beside a dead soldier near there.
COG Tag 12 – Act 4: Chapter 5 “Bon Voyage”
Before going to the Dock Yard, look for a COG logo on one of the containers on the right. The tag is behind the COG logo.
COG Tag 13 – Act 5: Chapter 2 “Black Out”
Get into the Silverback before going up the lift. When you get off of the lift, go into the room with 3’s marked on both sides where you will see a COG logo. Kick down the barricade, and you’ll find the tag inside.
COG Tag 14 – Act 5: Chapter 3 “Shattered Paradise”
In the plaza area right after you see the room with the white angel statue, look in the right corner to see a COG logo. The tag is on the ground nearby, laying by a dead body.
COG Tag 15 – Act 5: Chapter 5 “Ascension”
Once you escape from Queen Myrah, you will be on your way to find Adam Fenix. Look to your right for an area with video game machines. In the dark room, use your highlight ability and you’ll see some crates near a COG logo. Destroy the crates to find the tag.
