No. It is extremely disturbing and unnecessary. I see why you want to skip it.
The fourth level in Call of Duty Modern Warfare is No Russian (which can be skipped.)
Campaign screen.
No you cant but you can skip it.
Call of Duty: Modern Warfare 2 is rated 18 because it has a level called no Russian which is a terrorist level. you can easily switch this level off at the beginning of the game. call of duty 5 is a lot worse (blood and violence) than cod6 the only blood and gore in cod6 is in no Russian which you can turn off. online has no bloody violence and nor does offline. i cant state it more clearly the only reason it is an 18 is because of no Russian. if it wasnt for no Russian it would only be a 15.
Level 42
nothing
The Lieutenant Rank is at Level 34
You unlock it at level 36.
Level 38
You need to level and complete challenges
If you're talking about the museum level from Modern Warfare 2, then probably not. That was a one time thing.
Yes it can, When you reach that level a screen will pop up and it will say graphic scences or something and you can choose if you want to play or not