There are over 28 coop missions in this server-sided Desert Siege mission pack, and according to the readme files, they offer a real challenge! There are two groups of missions, Martyrdom and Carnage.

Each of the CPU intensive Martyrdom missions can take up to an hour to complete, and could have as many as 100 enemies. Some of these missions are of the Recon variety, so if you are a Recon fan, try them out.

The Carnage missions also offer a challenge for experienced coop players, and will require some new skills to complete them succesfully….

Grab the download here.