Campaign

Campaign, also known as Scenario, is currently available in the Korean Version of Combat Arms. In this new Game Mode, you follow a storyline of which predates Operation Sand Hog while facing of a numerable amount of A.I. controlled soldiers. It is said to be released in Nexon America soon. However, Nexon America released a game mode called Fireteam, came out on May 27th.

Known Gameplay
In the lobby, it is unknown if the host can change the starting amount of lives and time limit the players would have. But, it is known that the host can change the difficulty of the enemies.

Starting the match Each player has a certain amounts of lives. The top of the screen shows a score, presumably for your amount of kills. Below it is a timer with, of course, the time limit the players must finish the match. After a number of conflicts, players get to a "Checkpoint", where they can respawn instead of starting at the beginning at the map again, and at this spot they also obtain an extra life.

Interestingly, this game mode seems to have a storyline, as a person talks to the players by captions at times, unique objectives, and even cutscenes. It turns out that what happens when you lose your lives, you no longer fight, similar to Search and Destroy, and when everyone loses their lives you have to restart. Killed enemies increases the killer's points, and drops a shiny object (looks like a box of ammo, spinning) that anyone could get. It looks like it replenishes health and ammo (shown to only refill Primary Weapons in videos) if a player picks it up.

It is suggested not to rely heavily on Machine Guns or Sniper Rifles as your ammo will quickly run out. This is a source of many players dislike. Also, the fact that killed enemys often drop primed grenades upon their death seems to suggest that Shotguns are also being put into the dark.

The enemies
There are at least 6 types of enemies consisting through a Sand Hog like map (this is unconfirmed by official sites):