For clarification, Special Forces terminology herein I believe is being use incorrectly. Here below is a quick rundown of the forces which have greatly been developed in the last two (2) decades.
There is only one Special Forces (SF) better know as the "Green Berets" such as the those of the 10th SFGA, 7th SFGA, 5th SFGA, etc... and other SF Groups (units) which are under the command of the 1st Special Forces Command. Watch the movie "12-Strong"
What I believe that is being referred to here are special operations forces which each of the US military branches have: US Army, Navy, Marines and Air Force.
The following are Special Operations Forces (Special Operators) that are not SF Units which are within USSOCOM;
US Navy SEALS
Marine CSO (Marine Recon)
and, several other support and specialized units such as the 160 SOAR(a) and SYOPS
There is lots more to the above so feel free to click on the links or search for it.
so special operators being added to Squad, would be good. They operate in Teams, Squads, Squadrons, etc... then for the OPFOR (Opposing Force) you can include the non-US special operators such as the Spetnaz, Jeagers, SAS, GSG9, "the French Foreign Legions", etc.... However, this could be a game within itself due to the different type of missions as compare to regular military units.