Rating issues
The violence in this game is primarily displayed during the gameplay. You control a floating camera and look down upon the units you can control. These units are all machines and vehicles, piloted by humans. They respond to your actions with human voices and tell you when they are attacked. When their health bar runs out, the vehicle explodes. No screams are paired with this. The overall war theme of this game is also reflected in the cut-scenes. The same type of implied violence is scene here, such as the bombing of a base and vehicles that explode.
Other issues
On a couple of occasions the cut-scenes show a deceased soldier. No wounds are visible though. The word damn is used once, but not in an offensive manner.