is a giant gun turret that we need to activate. To do this we need to destroy three covenant signal jammers. These are located against the far wall of the room as we enter, unfortunately there are a lot of enemies hanging out in this room. The lot of them can easily be taken down with rockets and a few rounds of the minigun. When you are ready, destroy the three marked jammers. As you destroy them, a number of phantoms will swoop in to drop off additional covenant forces for you to blow up. Note that you can destroy the turrets on the bottoms of the phantoms so that they cannot shoot at you. Eliminate the enemies that they drop off. This will cause a number of banshees to come in and attack the area. Whilst this is going down another pair of phantoms will come in to drop off troops. Kill them all and continue to shoot down banshees until the objective is complete. When prompted to do so, hop out of the mantis and activate the marked switch. After a few moments, a story scene will play to complete the mission.