Enemies lurk in locations around the globe, waiting for the right opportunity to strike. As part of Delta Force, the U.S. Army's most secretive and highly trained unit, you have the skills and the firepower to hunt them down and take them out.
Most popular community and official game content for the past week.  (?)
What does popular mean?
It means the content you're seeing has been rated up more than it has been rated down for the given time period.