Great show. Although, it appears that they have toned down the lanugauage and vulgarity for television.
That MSgt. is great:
"you WILL po-lice that mooostache!" The actual Iraq comm chatter at the end credits is pretty cool too.
Regarding the scopes, I believe that is just added "kill flash". It shouldn't affect field of view, but does reduce the scopes light gathering a bit. But in a place like Iraq, that is only a minor issue, and only at dusk/dawn.