It's the early 21st Century, there have been multiple worldwide disasters which has prompted the forming of an international paramilitary organisation. This organisation was the GDF - Global Defense Force. This force was formed as a rapid-reaction force, in light of the Strogg invasion, they are now the only organisation with the means of protecting Earth.  They are the best of the best, the elite of the elite. And if they should fail, there is no hope left.

COVERT OPS

The GDF's Covert Operative specializes in stealthy infiltration, sniping, electronic sabotage, and reconnaissance. Rangers can use their PDA's to hack and disable enemy deployables, and deploy 3rd Eye cameras to spy on the enemy and relay their locations to his squad mates. The Covert Ops carries the N38 Sniper Rifle and smoke grenades.

Soldier

This is the GDF's assault class. The Soldier can choose heavy weapons, such as the N93 General Purpose Machine Gun (GPMG) and N72 LAW Rocket Launcher. He also carries Fragmentation Grenades and the High Explosive Charge

Medic

The Medic is a vital part of any GDF team. As well as packing the powerful N80 Assault Rifle, Medics supply health packs for the team, and can revive the fallen in the middle of battle.

Engineer

The Engineer is a support/defence class, constructing and repairing vehicles, deployables, and objectives (such as bridges and machinery). He also deploys and maintains defence turrets, such as the Anti-Personnel, Anti-Missile and Anti-Vehicle deployables. The Engineer carries the N22 Shotgun and multi-purpose mines.

Fire Support

The GDF's Fire Support specialist, the Field Ops can deploy Fire Support guns in the field and designate targets for them. His deployables include the Artillery Gun, Guided Rockets, and Strategic Hammer Launcher. He can also call in Air-Strikes and dispenses ammunition to his squad mates. He carries the N80 Assault Rifle.