There are no Cheats.

Just hints.
So if you want to post a hint,
Go for it.
Just following the Halo 1 theme we've been having lately.

I found this:
Obviously done by a kindergartner.



HUMAN WEAPONS

Pistol- Has scope capability, great for picking off Covenant at semi-long ranges. NOTE- good for level three

Sniper Rifle-Armor and shield piercing rounds, Good for cloaked Elites ant semi-long ranges (u will see elite's camouflage shimmer slightly)

Rocket Launcher-Basic Covenant-killer, Great for masses of grunts, hunters (can be a 2 for 1 deal)and especially Flood

Assault Rifle-Speedy, great for masses but not for sniping, OK with flood, and good with grunts
COVENANT WEAPONS
NOTE-Cannot reload (must get new)

Plasma Rifle-Great for masses and elite's, use in short bursts to avoid overheating (drains power quickly)

Plasma Pistol- Good for elites when cornered, Great for hunters when shot in back

VEHICLES

Warthog-fastest human vehicle, good for hunters (machine gun on back)

Tank-The best for masses, and spectacular for hunters. Real messy however (turns most covenant into mush and wrecks covenant vehicles

Ghost-Quick, hovering, OK shot but bad defense make this vehicle quite a dish, be careful however u can get blasted easily

Banshee-only thing that can fly but the best damn thing for just about everything