Siege Mode
In Siege you fight for control of a strategic zone, where one team defends (the Ghosts) while the other attacks (the Mexicans). If the attacking team manages to get inside the zone and survive for more than five seconds, they will win the game.
 
Original Ghost Recon Co-op Mode
In OGR Cooperative mode, you and your team-mates face off against hostile soldiers in enemy territory. Your mission is to reach the extraction point. The rebel troops have taken Camp Chapultepec and are using it as a staging area for their activities in the region. Their presence is increasingly affecting the operations of troops loyal to the Mexican President and the Ghosts are sent to deal with the situation before the rebels can fortify their position. This mode allows for up to 12 players to play together (3 teams of 4 players)!

Q. How did you articulate the different OGR Cooperative maps in terms of scenario?
A. Each map has a unique storyline that we hope will immerse the player in the adventure.
In “John Doe’s Hellhole”, the Ghosts are deployed in the suburbs of Mexico City and fight for control of every street corner as they struggle to put an end to the conflict. Snipers overhead make any foray into open streets a lethal risk. With several members down already, these cramped city streets are quickly becoming do or die for the Ghosts.
In “Ready for Bear”, the rebel troops have taken Camp Chapultepec and are using it as a staging area for their activities in the region. Their presence is increasingly affecting the operations of troops loyal to the Mexican President, and the Ghosts are sent to deal with the situation before the rebels can fortify their position.
Finally, in “Mayday, Mayday”, a US helicopter was shot down in Chapultepec Park some hours ago and the Ghosts are en route in to investigate. Intelligence has detected heavy enemy activity in the area and it is believed that rebels are moving the remains of the chopper to their stronghold at the castle.