Gears of War 3 Cheats :
EaSy Combat Engineer Ribbon on Horde
NOTE: There must be two active players!
When playing horde, build a turret, and keep firing bullets out of the turret. While the turret is firing, the second player rebuilds the turret while it is shooting, getting them the combat engineer ribbon. By doing this, you'll be able to level up faster while playing in Horde Mode.