Just a point of clarification Army Special Forces are rather something more than "just another airborne unit like the Rangers" although indeed they are part of SOCOM. I know that you have to be airborne qualified before Special Forces Assessment and Selection (SFAS), I'm not sure whether Ranger School is also required prior to applying for SFAS.*
The this is superior to that game - gets more than a little tiring particularly when it is apples and oranges that are being compared. For instance Supply Corps (Quartermaster Corps) Officers are needed every bit as much as are Naval Aviators or Ranger Officers. However, that said there is really no such thing as a unintelligent Special Forces operator - it requires a lot more than just graduation from Ranger School.
* I believe so and all SF personal are Ranger qualified