Three weapons glitch

This helpful glitch will allow players to obtain three weapons on the level Pillar of Autumn.

How to do it
When you finish talking to Captain Keyes, immediately turn around and go to the spot where you would normally receive ammo for your pistol. If you reach the corner near the bulletin board before you receive a loadpoint, you have done all you need to do to start the glitch. The Grunts will not spawn, so you do not have to worry about being weaponless. Move on forward, grabbing the Assault Rifle, and kill the enemies in the mess hall. Pick up a second weapon.

Once all the nearby enemies are dead, go back to Keyes. As soon as you're there, turn right back around and head back the way you came. This time, when you pass the loadpoint, you will receive pistol ammo, giving you three weapons: an assault rifle, a Covenant weapon of your choosing, and a pistol. This can be very helpful, especially on higher difficulties.