Four Banshees on The Package
From Halopedia, the Halo wiki
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Overview
The Four Banshees easter egg is an easter egg in Halo: Reach. It allows you to drive four Banshees in The Package.
Walkthrough
To perform it, two players must be playing and have to push the box under the Shade turret in the video. Then Player A must go further and destroy the tower next to the Scorpion Tank. When destroyed, go behind the tower and look for a button and press X. Have Player B wait and then press the button under the shade turret (If Player B fails to press the button after a short period of time it will disappear and it will have to be redone). When the two buttons are pressed, four Banshees will spawn on the roof on the first building.
