Halo 3 Vehicles
Banshee
The Banshee is a Covenant one person aircraft. Armed with plasma cannons and the fuel rod cannon it can wreak havoc to ground enemies and vehicles.
Chopper
A quick and dangerous, one person, Brute vehicle. With a large front wheel, jagged sides and auto cannons. It can wreak havoc to both foot soldiers and vehicles alike.
Elephant
The Elephant is a large, slow-moving repair vehicle found on Sandtrap. It comes equipped with a LAAG turret, similar to that of the Warthog, and can also hold additional turrets, player and flag spawn points, and even other vehicles, allowing it to act as a mobile base.
Gauss Warthog
A stronger, rarer variant of the Warthog. Pretty much exactly the same in every respect except it has a gauss turret mounted rather than a machine gun turret.
Ghost
A hovering Covenant one person vehicle. It can fire plasma bolts or boost into ground soldiers splattering them. Very good for transporting one person fast and quite safely. The front offers good protection from light weapons.
Hornet
A Human aircraft, counter to the Banshee. Its armaments include two machine guns and two missile launchers. Reportedly slower than the Banshee it has the ability to hover and move backwards.
Mongoose
A human ATV. It is quick and useful for transporting two people across the map quickly. Let a buddy hop on the back and he can fire his weapon to repel enemies. However, as it has no weapons of it's own, you'd better be quick enough to dodge enemy fire.
Prowler
A Brute equivilant of the spectre. Can hold four occupants, driver, gunner and two passengers. Has a similar aesthetic to the Chopper.
Scorpion Tank
The Scorpion is back. Now however it has become a two person vehicle, like the Wraith. One player drives the tank and fires the main gun, the other fires the machine gun turret. Aside from that, since Halo 2 the Scorpion has seen a slight aesthetical change and moves faster.
Warthog
It has recieved a significant power boost since Halo 2. A well driven Warthog with a gunner can cover a large area of ground. It has a chaingun mounted on the back and can support a passenger allowing for 3 occupants.
Wraith
The Wraith is the Covenant tank, armed with a plasma mortar and a plasma turret. It now allows for two passengers. One to drive and fire the mortar and the other to fire the plasma turret.
Halo 3 Equipment
Bubble Shield
Makes a bubble that does not allow bullets or grenades to pass either in or out.
Deployable Cover
A portable version of the directional shields you see littered in campaign. Useful for providing a vantage point against snipers or as simply extra cover in a firefight.
Flare
Emits a blinding flash to all that look at this when it goes off, great for confusing or temporarily stunning enemies.
Portable Grav-Lift
A smaller portable version of the anti gravity lifts see previously in the Halo trilogy. The lift stays active for a short while after being dropped. However, it can be destroyed.
Power Drain
The Power Drainer is an object that once activated emits an almost emp like blue pulse that depletes enemy Shields and causes Vehicles to stop. If the enemy stays in the Power Drainer's effective area for too long, they will die.
Radar Jammer
A piece of equipment that is similar to the Power Drainer, however it is red and has different effects. When activated it will cause the radars of nearby players to show large activity, and the enemy screen to flash.
Regenerator
Referred to as the "opposite of the Power Drainer". It will raise shields of players within proximity.
Trip Mine
One activated the Trip Mine will give off an orange glow and will emit a beeping sound. The mine is great against vehicles.
Weapons
Assault Rifle
The Assault Rifle has been brought back from the first installment in the Halo series with a few modifications like greater accuracy, more range, and more damage per hit. Accuracy is high when fired in bursts, and the overall accuracy of this weapon is good at medium ranges (even higher at close). This is a very good all round weapon that can be effective in almost all situations if used correctly, and is an even better weapon with grenades, and melee attacks, this goes with any weapon.
Battle Rifle
The Battle Rifle was one of the most popular weapons in Halo 2 for players with good aiming. In Halo 3, Bungie has balanced the weapons in a way that doesn't overshadow other weapons, yet not underpowered. With reduced aim assist, this weapon takes even more effort to be used effectively. And the new, heavier, sound is so rewarding. You're in a battle. Bring your Battle Rifle.
Beam Rifle
The Covenant beam rifle appears to be the Covenant forces' answer to the Sniper Rifle. Very little information has been confirmed about this weapon or its potential capabilities. This weapon does not use ammunition and will overheat when fired too quickly for too long, keeping the Beam Rifle on par with the human Sniper Rifle.
Brute Shot
The Brute Shot has been changed, going from a hard-to-find but effective weapon to a mainstay of campaign and a solid choice in multiplayer. It fires grenades which explode on contact, doing serious damage, especially in confined spaces.
Covenant Carbine
Unlike the Battle Rifle, the Carbine has seen few changes since Halo 2. It remains a powerful, accurate semiautomatic weapon with a moderately-sized clip. Because of the changes made to the Battle Rifle, however, the Carbine is now far more accurate than its human counterpart, and is rapidly overcoming the second-class status it had in Halo 2.
Energy Sword
The Energy Sword (also known as the Plasma Sword) returns, with a battery and a reduced lunge to bring it into the overall balance. It also has specific medals attributed to it.
Firebomb
The Type 3 AP/AM grenade is a Brute device that breaks when thrown, releasing a flaming gel that sticks to hard surfaces. The gel burns for around four seconds and can be used as a barrier or to kill players directly.
Flamethrower
The flamethrower is a support weapon, strong against both vehicles and ground units, but balanced by a relatively short range and limited ammunition.
Frag Grenade
Frag grenades have seen a drastic power nerf to make it fit more into the balance of the game. It can be devastating to infantry if used correctly. A well timed frag can also tip a Warthog.
Fuel Rod Gun
A heavy Covenant weapon that is a counter to the Rocket Launcher. Before Halo 3 it was only available for multiplayer use in Halo PC.
Gravity Hammer
A weapon similar to that of Tartarus' in Halo 2. A melee weapon that has a lunge shorter than the energy sword but has the power to knock back projectiles or vehicles out of the way.
Machine Gun Turret
Remember being sniped in Halo 2 when you were using the turret? This time round you can pick up the turret and move position! So no more easy target for snipers. Not only can you walk with this thing but its more powerful and the aim too has improved. Go take out their whole team or that one annoying Mongoose!
Magnum
The M6G Magnum does High damage to shielded enemy's, and Very high flesh damage, it is a good weapon on its own, however Dual M6Gs are very overpowering, and effective. Good at Close, Medium, and Semi-long ranges.
Mauler
A dual wieldable Brute shotgun that has less power than the human variant when single wielded, but can be more powerful when two are wielded.
Missile Pod
One of the new support weapons introduced in Halo 3. Like all support weapons, it slows the player and forces a third-person perspective. The missile pod can be thought of as a rebalanced answer to Halo 2's tracking rockets: it has a larger ammunition capacity than the rocket launcher and is capable of tracking vehicles, but each missile does less direct and splash damage than a rocket.
Needler
The Needler is back and more powerful than ever! However, it is now only single wieldable. But can seriously pack a punch at mid-close range.
Plasma Cannon
The Plasma Cannon, like it's Human counterpart, the Machine Gun, is a 3rd person Support Weapon that can be pulled off from the covenant turrets on a level.
Plasma Grenade
A Grenade of Covenant origin. That sticks to enemies and vehicles. It has seen a slight nerf in general, like the Frag Grenade. But still can be devastating if used correctly.
Plasma Pistol
The Plasma Pistol is the most basic of the Covenant weapons. The non-charged shot has little use. However, the overcharge can completely deplete enemy Shields allowing an easier kill with other weapons or it can overheat a vehicles engine, not allowing it to move for a few seconds. Pistol Whips! However it still allows the turret on the Warthog to fire.
Plasma Rifle
A rifle of Covenant origins that fires plasma bolts at the enemy. Like most Covenant weapons that fire plasma it helps to deplete shields faster than Human weaponry.
Rocket Launcher
The rocket launcher once more has no vehicle lock-on. That attribute was lost to the Missile Pod. In the Beta, the rocket had slight auto aim, it would bend course very slightly towards a player.
Sentinel Beam
A laser or Forerunner origin. The weapons of the sentinels. The Sentinel Beam is a battery powered laser.
Shotgun
The shotgun now sees a slight reduced clip. But is still devastating at close range.
SMG
No longer the default starting weapon as it was in Halo 2. This weapon is still dual wieldable it works well at close, to medium ranges and is considered to be similar to the Spiker. The SMG has increased accuracy, and range, making it much more effective than it was in Halo 2. The SMG also has a faster rate of fire.
Sniper Rifle
Long Range Sniper rifle with 5-10x scope. The Sniper Rifle can kill faster than Any other weapon in the game, due to its Single-headshot kill abililys. It is the most inferentially accurate weapon in the Halo series. It's Covenant counterpart is the Beam Rifle. It is rare to find multiple Sniper Rifles on maps. It is favorite to most long-range shooters. It is a VERY powerful weapon (boasting single head-shot kills and two shot kills on the rest of the body) It now has a Night-vision scope. The Sniper Rifle is VERY effective at long ranges, but can also be effective at Medium ranges, or Close ranges if used correctly.
Spartan Laser
Portable Power! The Halo 3 Spartan Laser is one of the new members of the Halo armory. It is designed for anti-vehicle use, but is also very effective as an anti-personnel weapon. The directed energy mechanism fires a highly charged laser beam that, if it hits, totally destroys the target. A brief charge time before firing and a small laser "pointer" coupled with humming noise makes surprise attack with this weapon somewhat tricky, but players caught out in the open against the Spartan Laser are usually left counting down to their respawn.
Spike Grenade
The Spike Grenade, a Brute technology, is one of the two new grenade types introduced in Halo 3. Spike grenades can be stuck to nearly any surface, including players, and spray shrapnel in one direction when they explode. Like a Plasma Grenade, sticking an opponent with a spike grenade is fatal.
Spiker
What some people call it the brutes SMG. It shoots out the spikes like the Spike Grenade.
SPECIAL
Ball
The Ball is the objective item of the game type Oddball. It is a skull that is carried to earn points. The ball is also technically a weapon as it can be used in a melee attack to kill a player.
Bomb
The Bomb is the key item in the Assault game type. The bomb is carried by a player, however the player can attack with the Bomb as a melee weapon, so it can be categorised as a weapon too.
Explosion
You get a kill by this if you indirectly kill somebody by causing an explosion. For example you destroy a Warthog with normal weaponry and when it explodes the explosion kills an enemy nearby.
Flag
The objective item of the Capture The Flag game type. A player carrying the flag can use it as a melee weapon.
Guardians
The Guardians are the mysterious entities that Bungie blames for all deaths that aren't caused by players. Deaths from falling, map features like Snowbound's turrets, or anything else the engine can't explain are credited to the Guardians.
Melee
Weapons can be used for more than shooting. Bludgeoning is an excellent way to finish off a weakened opponent or sneakily dispose of an unaware enemy. Weapons vary in the speed of their melee attack, and support weapons cannot be used to melee. Like many aspects of the multiplayer game, melee attacks have seen changes since Halo 2.