Seriously

2 years in training I believe.

It's not legal for anyone under the age of 18 to deploy so there is near zero chance of you seeing anything as "graphic" as seen while playing such games

Once you've got the practical experience the theory is much easier.

You have to be 18 to join the army or 17 with parental consent.

Since when do they send kids who can't even drive to the front lines without a permit?

OP, what country?

Because in most games they commit serious war crimes where in real war you usually don't.

Are retired army men and woman good at cod before/during/and after they served their country