Amphibious APC	The Amphibious APC (Armored Personel Carrier) is capable of traveling over land and water, while carrying up to 5 infantry units. It is very fast, but suffers some movement penalty over certain terrain because it is a wheel-based unit.
Volverine	Also known as the Wolverine. A nasty little infantry shredder, the Powered Assault Armor is a staple in GDI's army. It's heavy armor and high versatility make it a unit that is well worth the price. This is supposed to replace the Humm-Vee for it's infantry hurting skills.
Titan	This machine is also known as the Titan Mech. This beast of a machine stands 18-feet tall, and carrys a large, large gun. It's is the only unit with the Mammoth Mark II (excluding aircraft) that can fire over the top of walls. It will surely be a very important unit for the Global Defense Initiative.
Mammoth Mark II	You might remember the mammoth tank of the original C&C. It has come back in TS, however, only the name remains the same. The Mammoth Mark II is GDI's biggest unit, ressembling the enormous AT-AT Walker from the late Star Wars. It is so big that it won't fit on a carry-all. Not much is known of this unit but it's devastating power. Carrying two nose-mounted rail guns and a battery of ground to air missiles, this unit is so powerful (and expensive) that you can use one at a time (you can build another one untill the one you currently have is destroyed).
Disruptor Tank	Three words. Big, Powerful and Expensive. That about sums up the Disruptor Tank. It's powerful disrupting beam attacks at the sub-atomic level, leaving whatever used to be there in a pile of gelatin. Don't forget, though, that it can harm your units just as much as the enemy's, so keep it in the open.
Subterranean Flame Tank	Affectionately nicknamed "The Devil's Tongue", the Subterranean Flame Tank can burrow underground, and pop up to reek almighty havoc on GDI infantry and light armored units. It also has another ability that allows it to release all of it's gas if it's a veteran unit. It will burn all at once, automatically, and the Flame Tank will need to get refilled at a Repair Bay.
Tick Tank	While it might look the same as any other lightly armored tank, the Tick Tank has the special ability to burrow itself partway into the dirt, effectively doubling it's defense, while it fires it's Dual Cannons.
Advanced Recon Cycle	The fastest vehicle in the game, the Advanced Recon Cycle may not have the best armor, but it doesn't need it. It can drive in, fire off some rockets, and drive away.
Mobile Artillery	The Mobile Artillery returns in Tiberian Sun, but some things have changed. The Mobile Artillery has to deploy, and set up recoil braces, before it will be able to fire. This could make for an excellent base defense system.
Stealth Tank	The Stealth Tank is still much the same as it was in the original. It can still cloak with the best of them, and it's speed and rocket-firing abilities making it a primo choice for those covert attack missions.
Subterranean APC	The Subterranean APC, not unlike the Flame Tank, can travel underground carrying several infantry units in order to pop up in the middle of an enemy base, unload the infantry and attack.