Instructions
Play through the Special Ops mission and wait until you hear a loud gong sound. Each gong sound indicates a nearby juggernaut.
Send one player out to draw the juggernauts into a wide open space where the second player will be waiting. The second player should line up so that his back is to a wall.
As soon as you see the juggernauts, turn around and press in the left analog stick on the controller to run back to the area where your partner is waiting.
Throw a flash bang grenade at the juggernauts using the "L3" button. This will stun them temporarily, allowing the second player to get in a few quick shots. Aim for the head and use the .50-caliber sniper rifle. It takes approximately five shots with this gun to kill a juggernaut.