Global Defence Initiative - Vehicles  
Here is the complete list of GDI vehicles in Tiberian sun with descriptions and pictures:  
Picture   Description
  In my oppinion this is the most impotrant vehicle in the game. Because without money you can do nothing. IT's recommended to have at least 2 harvesters per refinery.
  Armored walker. Maybe I should have put it in infantry section but I didn't so here it is. It is very effective against infantry and is very fast so you can use it for scouting.
  All purpose unit. Great for attacking. It has greater range than NOD laser posts so it can destroy them without getting damaged. Great in tems of 5 to 8 units combined with hover MLRS.
  Used to carry up to 5 infantry units. Best combination is a ghost stalker plus 4 engineers. That is the most lethal combination.It's amphibious so it can pass water surfaces.
  Great for base defence against air units and tanks but is very voulnerable to disc thrower attacks. It has weak armor.
  Excellent against groups of units because it's wave damages all units in it's path inculuding yours. Be carefull because it can do a lot of damage to your base.
  Most powerfull vehicle in the game. Can defend itself against air units and it's weapon is deadly against allmost everything. If you can tsy sneaking one of those suckers in the enemy base using carryall.
  If you are fighting against NOD this is a must because it detects underground and cloaked units.
  Used to expand your base.
   
    Air Units
  Can transport any vehicle to any destination.
  Great against tanks and for fast attacks on enemy base for finishing damaged buildings.
  Most powerfull air unit. Deadly against infantry and enemy buildings but it is very slow. Especially efective against NOD Tick Tank and artillery.