Halo Wars/USNC Units

Warthog

 * Cost: 150
 * Damage: Medium
 * Supply: 1
 * Speed: Fast

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 it's 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.

Marine

 * Cost: 100
 * Damage: Low
 * Supply: 1
 * Speed: Medium

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 or medics. It's a cheap unit that can be stationed on towers and work great against air units.

Flamethrower

 * Cost: 100
 * Damage: Low
 * Supply: 1
 * Speed: Medium

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
 * Supply: 0 (max of 3)
 * Speed: 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. Their initial starting ability is the vehicle hijack, which steals an enemy vehicle and gives it to you. You can only have 3 of these guys at any given time, but they don't use regular supply.

Scorpion

 * Cost: 500
 * Damage: High
 * Supply: 5
 * Speed: Slow

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.