Before you say"GO BACK TO COD NOOB!" let me explain why im asking this. So I was looking through pictures and noticed Militaries used the shotguns as Back up weapons and police used it by itself. And in the MOH level Dante used an M249,M104, and M9. So what do you think?

And it said this wikipedia "In modern times, with Mechanized Infantry tactics armed forces don't need to "march to battle" as in earlier conflicts. Because of this, they are able to omit the difficult choice of selecting only one weapon in order to save weight. This allows the individual soldier to carry a shotgun as well as an assault rifle during battle"