Saudi Arabia, one of the world's leading oil suppliers and a key U.S. ally, has been taken over by a highly organized group of radical terrorists. The government is in a state of collapse and turmoil and you have been chosen to lead the United States' armed forces to restore control. Search and destroy using the latest military hardware from the Abrams tank to the Apache helicopter in realistic settings ranging from the open desert to close-quarters infantry combat. Wear down enemy morale by capturing vehicles, weapons and buildings. You'll need elite forces to destroy the world's best-armed fanatics, bent on world-wide economic collapse. The soldiers who survive will gain experience and move with you from mission to mission.Go to: http://store.steampowered.com/ and download STEAM client
Click “Install Steam” (from the upper right corner)
Install and start application, login with your Account name and Password (create one if you don’t have).
Please follow these instructions to activate a new retail purchase on Steam:
Launch Steam and log into your Steam account.
Click the Games Menu.
Choose Activate a Product on Steam…
Follow the onscreen instructions to complete the process.
After successful code verification go to the “MY GAMES” tab and start downloading.