Aside from certain weapon selection(s)* available I would say this game is still more Infantry based than Special Forces. Consider the Specialist mode, this is you're average squad escorting an individual to perform a series of tasks. They aren't going in to rescue some POWs or hostages, nor are they going in capture some general. Just think of the Specialist as a technician or an engineer. And considering the large amount of multi-nation coalition fighting going on nowadays, consider the choice in weapons to reflect your choice in nationality or role. You use the Fa Mas, it’s because you're from France, use the M-16 you're from America, use a SAW it because you choose to be a gunner, or were assigned it (I'm generalizing just a bit here.) And Tiffy’s right, most sections are 8 strong, and that’s where most of the fighting and organization takes place.
* As for weapons I don't think represent infantry: Submachine guns, shotguns, and pistols. Pistols are usually only trained with when in a leadership role (as I understand it) and are rarely issued even then. Shotguns and submachine guns are used for CQB (if that, more likely MP work) and is not something the infantry use. Also I question the use of some of the attachments in modern-day fighting, i.e. suppressors. Again not something most grunts get issued.