Rating issues
As a flight simulator game the emphasis is on flying, tactics and strategy. Combat consists of either dogfights against aircraft or attacking ground targets.
Although the consequences of aerial combat against enemy aircraft is that characters are killed, you do not actually see any violence inflicted on human characters. Therefore the violence in this instance is deemed to be implied.
The result of attacks against ground targets such as anti-air artillery, tanks, artillery, trains and vehicles are seen as a cut scene which replays the concluding part of the attack. For example, soldiers are seen running from vehicles which have been subjected to an attack and then falling to the ground and the disappearing from view. The violence is regarded as non-realistic looking. There are no blood effects.
Other issues
The game features online playing capability which may involve real-time interaction with other players