The Global Defense Initiate (GDI for short) is a peace keeper of sorts in the Command & Conquer universe. These guys are bent on saving humanity from whatever horrendous plans Kane and his Brother of Nod has in-store for it. This 'stand tall' and 'face the enemy head-on' attitude reflects in GDI’s play style too; GDI’s units are designed in such a way, that they’re really good at holding the line, defending or standing their ground when its required. They’re not too good at hit and run tactics since they’re forces aren’t too mobile (at least most of their forces aren’t), but to make up for this, they’ve got some of the most powerful and damage absorbing units in the game. If you’re new to the game, GDI’s the way to go!
Infantry
GDI’s basic infantry comprises of Riflemen and Missile squads. Their Riflemen are the most unique and arguably the most useful basic infantry of all 3 races; the thing that makes them unique is their 'Dig in' ability. For a mere $300, your Riflemen squad sets up a bunker that protects him from enemy fire. Coupled with the cost of the Riflemen squad (that costs $300), you have a bunker you can place anywhere on the map for just $600! Use this to your advantage, and always take Riflemen squads when you’re expanding, defending, or attacking, since their added firepower really helps take out the initial units. Another thing you can do is, once the bunker is built, order the squad to exit it and get a Missile squad inside it – Viola! You’re very own anti-vehicle/aircraft bunker!
The advance infantry units of GDI consist of Grenadier Squads, Snipers and Zone Troopers. Out of the three, the Zone Troopers are my favorite. These guys are basically the Jump Jet Infantry on crack. They have a mini-rail gun that’s effective against small infantry squads as well as vehicles. What makes them extremely important to GDI players is the fact that they’re really mobile, since they have the ability to ‘Jump Jet’ over small obstacles like creeks and small hills. If you’re playing on a relatively smaller map, get these guys early on and send a few squads to harass your enemy. If your enemy doesn’t have adequate defenses, these guys will tear through their Tiberium Harvester and Buildings like a hot knife through butter.
i dunno coz they"l be easily destroyed by a swarm of buzzers 
