Halo Wars/USNC Units

Warthog

 * Cost: 150
 * Damage: Medium
 * Supply: 1
 * Speed: Fast
 * Armour: Light/Medium
 * Shields: None

The Warthog is a fast ground vehicle that is given to you at the start of the game. It's good for scouting because of its speed. While it starts with the ram ability, it needs upgrades to allow it to attack from a range. It's best used to scout and collect resources or against light infantry. And it can also be upgraded with a marine with a grenade launcher in the passenger seat, and a gauss cannon.

Marine/ODST

 * Cost: 100
 * Damage: Low (Medium with ODST upgrade)
 * Supply: 1
 * Speed: Medium
 * Armour: Very Light (Medium with ODST upgrade)
 * Shields: None

The Marine is a cost-effective unit that can be massed quite easily. Marines fire at a range and can be outfitted with upgrades that give them extra members, grenades, RPGs or medics. It's a cheap unit that can be stationed on towers and work great against air units. When the ODST upgrade is researched it turns marine squads to ODST squads. They are also able to be hot-dropped into battle and are way stronger and tougher than the marines.

Flamethrower

 * Cost: 100
 * Damage: Low
 * Supply: 1
 * Speed: Medium
 * Armour: Very Light
 * Shields: None

The flamethrower is an anti-infantry unit. It will do great against packs of marines and other infantry units. However, it can not attack air and its attacks are considerably less useful against vehicles. Mass this if your enemy is massing infantry.

Spartan

 * Cost: 300
 * Damage: Medium (High with Spartan Laser)
 * Supply: 0 (max of 3)
 * Speed: Medium
 * Amour: Medium/Heavy
 * Shields: Light/Medium

The Spartan is a strong unit that can handle small groups of units easily. They can be outfitted with chain guns that make their damage increase quite significantly, and can also be upgraded with Spartan Lasers. Their initial starting ability is the vehicle hijack, which steals an enemy vehicle and gives it to you. You can only have three of these guys at any given time, but they don't use regular supply.

Scorpion/Grizzly

 * Cost: 500
 * Damage: High (Very High with Grizzly upgrade)
 * Supply: 5
 * Speed: Slow/Medium
 * Armour: Heavy (Very High with Grizzly upgrade)
 * Shields: None

Scorpions are the main vehicle unit, adept against infantry and against buildings as well. Their special ability launches a powerful attack against any ground target. They are slow however.

Hornet

 * Cost: 250
 * Damage: Medium
 * Supply: 2
 * Speed: Fast (Flight)
 * Armour: Light
 * Shields: None

The UNSC's main flight unit is fast and agile, but is very easy to be taken down. However, it can be upgraded with two marines on the side plates and chaff pods, which reduce the chance of missiles hitting it. These aircraft are good against enemy vehicles and lone infantry. Either use these in groups or have them go with ground units, otherwise enemy fire will concentrate on the hornets and you will lose them.

Vulture

 * Cost: 900
 * Damage: High
 * Supply: 6
 * Speed: Medium (Flight)
 * Armour: Very Heavy
 * Shields: None

This is the UNSC's Uber unit, which can be upgraded with 2× missile silos, which doubles the damage for the secondary attack. Its primary attack uses two dual-cannons at the front of the ship, and the secondary attack fires lots of missiles at your target. Just one of these can take down a base!

Elephant

 * Cost:
 * Damage: Medium
 * Supply:
 * Speed: Very Slow
 * Armour: Heavy
 * Shields: None

This is a moblie base that can be deployed using the secondary attack button. Once deployed it can create all infantry units. It can be upgraded with better engines, better armour and a machine gun turret that only works when deployed.