How to Survive a Long Time in Lone Wolf on Halo Reach

Once the level starts, get sprinting. Find the Drop Shield and rocket launcher.

Once the Covenant starts advancing, take them out with your DMR. Aim for the heads. Shoot until you run out of ammo.

Pick up any other available weapon. Fight until they start to swarm you. Retreat to the tower with the machine gun turrets.

Fire on the Covenant with the machine guns. Once they start to converge on you, detach them and open fire.

Use the Drop Shield whenever your shields are down. Once the Energy Sword Elites arrive, obliterate them with the rocket launcher. Grab the Energy Sword and go straight back to the tower.

Stay on the tower, and laugh as they hopelessly attack you one at a time. You will survive until you are ready to just give up out of boredom.