This video shows the Gears of War 3 COG Tags Locations Guide of all 5 COG Tags in ACT 1.
For the complete Gears of War 3 COG Tag Locations Guide, visit this page:
http://www.videogamesblogger.com/2011/09/20/gears-of-war-3-cog-tags-locations-guide-xbox-360.htm
