Each group member is able to make an event, so if you want to find people to play in multiplayer or co-op just make an event.

~"Special Ops returns with a bevy of additions, including 16 new objective-based missions and the all-new Survival Mode. Team up online, locally, or play solo and face endless waves of attacking enemies throughout every multiplayer map. Purchase and customize your weapons, air support, equipment and abilities to stand up against increasingly difficult forces and land a spot on the leaderboards.

Earn experience and rank up with the newly implemented progression system. The higher the rank, the more weapons, air support, and gear armories you will have available to customize so you can change your tactics on the fly. In addition to the action packed battle for freedom, the cooperative Survival Mode also serves as an effective training tool for competitive multiplayer action."

-"The Spec Ops mode in the Call of Duty Modern Warfare 3 will feature a new progressive ranking system, online matchmaking system and leaderboards.

A new Survival Mode was also detailed, taking place on Modern Warfare 3's multiplayer maps. Players will fend off never-ending waves of enemies, including attack dogs, suicide bomber dogs, and eventually kamikaze soldiers.

'You definitely have to change up your strategy as the enemy changes up,' Robert Bowling of Infinity Ward told USA Today. "

-"Infinity Ward and Sledgehammer Games have revealed that Modern Warfare 3 will feature a new Survival Mode. Survival Mode features one to two players fighting endless waves of enemies with each wave getting more difficult. Despite being much compared to the World at War Nazi Zombies mode, enemies do not spawn at fixed locations like the zombies do, but instead, at tactical positions based on the current location of the player. The mode will be available on all multiplayer maps in the game and in the mode, players can earn "cash" for items such as weapons, upgrades and ammo"

This group doesn't work yet, so you don't have to write in comments anything now.
The group will start working from the November.
Until then we're just looking for members.

But before November you can play with other members spec ops co-op in Modern warfare 2 or Black ops zombie co-op.