Infinite spartan laser in halo mission

Use this cheat to get unlimited ammo in the "halo" mission. Play through the level until you meet up with Sergeant Johnson. Shoot him until he falls and drops the spartan laser than pick it up and shoot him, keep doing this until he kills you. When he respawns shoot him again he will drop the spartan laser pick it up. You will notice that he has another one on his back shoot him again this time when he falls to the ground pick up the spartan laser that he dropped. You should now have unlimited ammo it comes in handy trust me.